Consulta: subjectFacets:"Antioxidants"
Registros recuperados: 100
Data/hora: 14/05/2024 14:30:31

A comparison of methods employed to evaluate antioxidant capabilities
Provedor de dados: 48
Autores: PEREZ,DRUSO D; LEIGHTON,FEDERICO; ASPEE,ALEXIS; ALIAGA,CAROLINA; LISSI,EDUARDO.
Thrce ditferent methodologies frequently employed to evaluate the indexes that report the antioxidant capabilities of pure compounds and/or complex mixtures of antioxidants are applied to a series of mono- and polyphenols, as well as to two wine (red and white) samples. These methodologies are based on the bleaching of a stable radical, the effect of the additive upon luminol chemiluminescence induced by peroxyl radicals, and the effect of the additive upon the bleaching of the fluorescence from a dye molecule. Widely ditferent responses are obtained from the different methodologies. These differences are interpreted in terms of the different factors (stoichiametric factors and/or reactivities) that determines the indexes evaluated by these different...
Tipo: Journal article
Palavras-chave: ABTS radical bleaching; Antioxidants; C-phycocyanin bleaching; Total antioxidant reactivity; Total reactive antioxidant potential.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000200006

Actividad antioxidante de algas y plantas marinas de la plataforma insular cubana
Provedor de dados: 20
Autores: Valdés, O.; Hernádez, Y.; Fernández, M.D.; Hernández, I.; Rodriguez, M.; Cano, M.; Laguna, A.; Díaz, C.; Cabrera, B.
En el presente trabajo se estudia la capacidad antioxidante de varios extractos, acuosos e hidro-alcohólicos obtenidos a partir de algas y plantas marinas de la plataforma insular cubana. A todos los extractos se les determinó su contenido de polifenoles, proteínas, lípidos y azúcares totales, así como la actividad Superóxido Dismutasa (SOD). Todos los extractos evaluados mostraron una buena actividad antioxidante, con una CE50 inferior de 0,4 mg.ml-1. El contenido de polifenoles en los extractos de Ulva fasciata es menor el de las otras especies, aunque tanto el extracto hidro-alcohólico como el del alga seca e irradiada de dicha especie presentan una buena actividad antioxidante. El extracto hidro-alcohólico de Thalassia testudinum presenta el mayor...
Tipo: Journal Contribution
Palavras-chave: Proteins; Antioxidants; Proteins; Antioxidants; Http://aims.fao.org/aos/agrovoc/c_6259; Http://aims.fao.org/aos/agrovoc/c_511.
Ano: 2008
URL: http://hdl.handle.net/1834/2820

Actividad antioxidante en extractos de algas marinas
Provedor de dados: 20
Autores: Fernández, M.D.; Hernández, I.; Aneiros, A.; Tello, J.
Entre otras múltiples reacciones, los radicales libres pueden interactuar con ácidos grasos de las membranas celulares y causar la destrucción oxidativa de las mismas; a este proceso es al que se le denomina lipoperoxidación (Echeverry, 1998). Como defensas frente a las agresiones de los radicales libres se presentan una serie de sistemas enzimáticos entre los que destacan la superóxido dismutasa y la catalasa. En los organismos marinos se han encontrado compuestos con actividad antioxidantes fundamentalmente en algunas especies de algas. En este trabajo se realizó la evaluación del efecto antioxidante de los extractos de 6 algas mediante los métodos de inhibición de la peroxidación lipídica, determinación de la actividad mimética superóxido dismutasa...
Tipo: Other
Palavras-chave: Antioxidants; Algae; Experimental research; Antioxidants; Algae; Http://aims.fao.org/aos/agrovoc/c_511; Http://aims.fao.org/aos/agrovoc/c_258.
Ano: 2007
URL: http://hdl.handle.net/1834/2604

Antimicrobial, Antioxidant and Cytotoxic Activity of MarineStreptomyces parvulus VITJS11 Crude Extract
Provedor de dados: 52
Autores: Naine,S. Jemimah; Devi,C. Subathra; Mohanasrinivasan,V.; B,Vaishnavi.
The main aim of the study was to evaluate the bioactive properties of ethyl acetate crude extract of Streptomyces parvulus VITJS11 with a view to assess their therapeutic potential. The biological activity of ethyl acetate extract was tested against fungal and bacterial pathogens. The free radical scavenging potential of the crude extract was determined by DPPH assay. The chemo preventive properties of S. parvulus VITJS11 ethyl acetate extract was examined by MTT assay on HepG2 cells. The morphological, physiological and the biochemical properties of the strain S. parvulus VITJS11 was confirmed by conventional methods. Genotypic characterization was done using 16S r-DNA partial gene amplification and sequencing. The authenticity of the crude chemical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Marine actinomycetes; Streptomyces parvulusVITJS11; Antimicrobial activity; Antioxidants; Cytotoxicity; Bioactive compounds.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132015000200198

Anti-obesity Effects of the Administration of Tournefortia paniculata Cham Extract on Wistar Rats Subjected to a Hypercaloric Diet
Provedor de dados: 52
Autores: Simão,Anderson Assaid; Ramos,Vinicius de Oliveira; Corrêa,Angelita Duarte; Sousa,Raimundo Vicente de; Marcussi,Silvana.
The aim of this study was to evaluate the therapeutic and toxicologic effects of the administration of the powered vegetable extract and aqueous extract of Tournefortia paniculata leaves on Wistar rats, subjected to a hypercaloric diet for 42 days. The rats were divided into five groups and were given the following treatments by gavage: T0 (control) - 1.0 mL water day-1; T1 - aqueous extract containing 14 mg phenolic compounds kg-1 rat day-1; T2 - 14 mg quercetin kg-1 rat day-1; T3 - 50 mg powered vegetable extract from T. paniculata leaves (PVE) kg-1 rat day-1 and T4 - 100 mg PVE kg-1 rat day-1. The treatments did not significantly alter the weight, but were effective in reducing liver fat, glucose and serum triglycerides. The treatment T1 reduced food...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Obesity; Medicinal plants; Pharmacology; Antioxidants; Genotoxicity.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132015000400494

ANTIOXIDANT ACTIVITY DURING STORAGE OF APPLES SUBJECTED TO IRRADIATION
Provedor de dados: 64
Autores: Fante,Camila Argenta; Elias,Heloísa Helena de Siqueira; Henrique,Paôla de Castro; Boas,Ana Carolina Vilas; Lima,Luiz Carlos de Oliveira.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Postharvest; Storage; Antioxidants; Food quality.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542015000300269

Antioxidant activity of bee products added to water in tebuconazole-exposed fish
Provedor de dados: 83
Autores: Ferreira,Daiane; Unfer,Taís Cristina; Rocha,Hélio Carlos; Kreutz,Luiz Carlos; Koakoski,Gessi; Barcellos,Leonardo José Gil.
An experiment was conducted to evaluate the potential of honey, propolis, and bee pollen for the reversal of lipid peroxidation induced by tebuconazole (TEB) in South American catfish (Rhamdia quelen), in which the concentration of thiobarbituric acid reactive substances (TBARS), the activity of the antioxidant enzyme glutathione-S-transferase (GST) and the concentrations of non-enzymatic antioxidants, reduced glutathione (GSH), ascorbic acid, and non-protein thiols were assessed. Honey (0.125 g L-1) and bee pollen (0.05 g L-1) added to the water reverse the production of TBARS induced by TEB, while propolis demonstrated a pro-oxidant effect, inducing an increase in TBARS production. The data presented herein suggest that the addition of water to honey and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Bee pollen; Honey; Lipid peroxidation; Propolis; Tebuconazole.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000100021

Antioxidant activity of oily extract obtained from Lippia origanoides improves the quality of bovine embryos produced in vitro
Provedor de dados: 45
Autores: Sollecito,N.V.; Pereira,E.C.M.; Grázia,J.G.V.; Neves,B.P.; Couto,B.V.R.; Andrade,V.B.; Miranda,M.S.; Silva,J.K.R.; Borges,A.M.
ABSTRACT The aim of this study was to evaluate the supplementation of embryo culture medium with antioxidant obtained from oily extract of Lippia origanoides on in vitro blastocyst development and quality. Oocytes collected from slaughterhouse ovaries were matured and fertilized in vitro following standard laboratory procedures. Zygotes were cultured in SOF medium supplemented according to the following treatments: T1 embryo culture medium without antioxidant supplementation; T2)50μM/mL Cysteamine; T3)2.5μg/mL; T4)5.0μg/mL and T5)10.0μg/mL of antioxidant obtained from oily extract of Lippia origanoides. On the seventh day of culture, the blastocysts were fixed and evaluated for apoptosis rates, number of total cell and inner cell mass cells by means of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Apoptosis; Lippia origanoides; In vitro embryo production.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352019000300723

Antioxidant, analgesic and anti-inflammatory effects of lavender essential oil
Provedor de dados: 42
Autores: SILVA,GABRIELA L. DA; LUFT,CAROLINA; LUNARDELLI,ADROALDO; AMARAL,ROBSON H.; MELO,DENIZAR A. DA SILVA; DONADIO,MÁRCIO V.F.; NUNES,FERNANDA B.; AZAMBUJA,MARCOS S. DE; SANTANA,JOÃO C.; MORAES,CRISTINA M.B.; MELLO,RICARDO O.; CASSEL,EDUARDO; PEREIRA,MARCOS AURÉLIO DE ALMEIDA; OLIVEIRA,JARBAS R. DE.
Several studies have investigated the antinociceptive, immunomodulatory and anti-inflammatory properties of compounds found in the lavender essential oil (LEO), however to date, there is still lack of substantial data. The objective of this study was to assess the antioxidant, anti-inflammatory and antinociceptive effects of lavender essential oil. The 1,1-diphenyl-2-picrylhydrazyl radical decolorization assay was used for antioxidant activity evaluation. The anti-inflammatory activity was tested using two models of acute inflammation: carrageenan-induced pleurisy and croton oil-induced ear edema. The antinociceptive activity was tested using the pain model induced by formalin. LEO has antioxidant activity, which is dose-dependent response. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Inflammation; Lavender; Nociception.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000301397

ANTIOXIDANT CAPACITY OF PEQUI (Caryocar brasiliense Camb.) PULP IS PRESERVED BY FREEZE-DRYING AND LIGHT-RESISTANT PACKAGING
Provedor de dados: 94
Autores: NASCIMENTO,NARA RÚBIA RODRIGUES DO; ALVES,ALINE MEDEIROS; SILVA,MARA REIS; NAVES,MARIA MARGARETH VELOSO.
ABSTRACT  Pequi (Caryocar brasiliense Camb.) pulp is rich in bioactive compounds. However, seasonality and perishability limit its availability in the market. This work aimed to determine the physicochemical characteristics, including phenolic compounds and carotenoid concentrations, as well as the antioxidant capacity of lyophilized pequi pulp during storage in various packaging materials for 180 days. Pequi fruits were pulped, ground, freeze-dried and then vacuum packaged in transparent polyethylene (TP), polyethylene coated by aluminum foil (PA) and laminated foil (LA), respectively. The samples were stored under controlled temperature, humidity and luminosity. Proximate composition, phenolic compounds and carotenoids concentrations, and antioxidant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Carotenoids; Caryocar brasiliense; Cerrado; Pequi.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452017000100901

Antioxidant potential of various solvent extract from Morus alba fruits and its major polyphenols composition
Provedor de dados: 65
Autores: Kobus-Cisowska,Joanna; Szczepaniak,Oskar; Szymanowska-Powałowska,Daria; Piechocka,Justyna; Szulc,Piotr; Dziedziński,Marcin.
ABSTRACT:  Extraction conditions are an important factor in the process of obtaining bioactive compounds from plant matrix. These compounds differ structurally. Structures of phyto-compounds and their interactions with other food ingredient are not fully known, while these two aspects should play a significant role in extrahents choice and determination of extraction process conditions. Mulberry (Morus alba) is a plant growing in Asia, which fruits are rich in bioactive ingredients and high anti-oxidative potential. In our study we analyzed mulberry fruits extracts differing in the extra hent applied: acetone, methanol, ethanol and water. All tested extracts possessed rich polyphenolic composition and radical scavenging ability. The significant differences...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morus alba; Antioxidants; Phenolic acids; Flavonoids.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782020000100751

Ascorbate protects (+)-catechin from oxidation both in a pure chemical system and human plasma
Provedor de dados: 48
Autores: LOTITO,SILVINA B; FRAGA,CESAR G.
We evaluated the interaction between ascorbic acid (AA) and (+)-catechin (CTCH) in potassium phosphate solution, pH 7.4 (PPS) and in human plasma. In both systems, the oxidation was started by adding 2,2’-azobis-(2-amidinopropane) clorhidrate (AAPH). The concentrations of AA and CTCH were determined by HPLC using electrochemical detection. In PPS, CTCH was oxidized by AAPH (50 muM), in either the absence or presence of different initial concentrations of AA (25-200 muM). In the presence of AA, CTCH depletion was delayed, an effect that was dependent upon the initial concentration of AA. When 100 muM AA was added after the oxidation had begun, CTCH depletion was arrested for 30 min. The kinetics of AA oxidation by AAPH was also characterized in PPS. AA (100...
Tipo: Journal article
Palavras-chave: Catechins; Antioxidants; Free radicals; Procyanidins.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000200015

Assessment of antioxidants status and superoxide dismutase activity in HIV-infected children
Provedor de dados: 55
Autores: Pugliese,Camila; Patin,Rose Vega; Palchetti,Cecilia Zanin; Claudio,Cristiane Chiantelli; Gouvêa,Aída de Fátima Thomé Barbosa; Succi,Regina Célia de Menezes; Amancio,Olga Maria Silverio; Cozzolino,Silvia Maria Franciscato; Oliveira,Fernanda Luisa Ceragioli.
Objective:This study aims to assess the nutritional status of selenium, copper and zinc; and also the erythrocyte superoxide dismutase activity of HIV-infected children compared to a control group.Methods:A cross-sectional study was carried out with prepubertal HIV-infected children (n = 51) and their healthy siblings (n = 32). All biochemical measurements including plasma selenium, serum copper levels, serum and erythrocyte zinc levels and erythrocyte super-oxide dismutase activity were evaluated according to dietary, clinical and biochemical parameters.Results:Compared to the control group, the HIV-infected children had lower z-score values for height-for-age (p = 0.0006), higher prevalence of stunting (11.8%) (p = 0.047), lower selenium levels (p =...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; HIV and nutrition; Oxidative stress; Trace elements.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702014000500481

Avenanthramides and nutritional components of four mexican oat (Avena sativa L.) varieties
Provedor de dados: 115
Autores: Ortiz-Robledo,Faviola; Villanueva-Fierro,Ignacio; Oomah,B. Dave; Lares-Asef,Ismael; Proal-Nájera,J. Bernardo; Návar-Chaidez,J. Jesús.
Oat (Avena sativa L.) is a cereal grain, its seeds are rich in nutrients, is consumed as whole grain with health benefits fot humans due to its antioxidants, such as the avenanthtamides (Avns). The contents of Avns 2c, 2f and 2p were evaluated by HPLC in groats and hulls of oat varieties Chihuahua, Cuauhtemoc, Raima and Avemex cultivated in Durango, México. The association of these Avns with protein, fat, crude fiber and ash of oat was also investigated. A 4x2 bifactorial design was used, with the number of varieties and groats ot hulls as factors. Avns contents differed significantly (p&lt;0.05) among oat varieties, groats and hulls. Avemex groats had the highest concentrations of Avns: 3.6±0.7, 3.0±0.5 and 3.3±0.6 mg kg-1 fot 2c, 2f and 2p Avns. Avemex...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Groats; Hulls; Oat; Polyphenols.
Ano: 2013
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952013000300002

Bioactive compounds and antioxidant activity three fruit species from the Brazilian Cerrado
Provedor de dados: 94
Autores: Moreira-Araújo,Regilda Saraiva dos Reis; Barros,Nara Vanessa dos Anjos; Porto,Rayssa Gabriela Costa Lima; Brandão,Amanda de Castro Amorim Serpa; Lima,Alessandro de; Fett,Roseane.
Abstract  The aim of this study was to determine the content of bioactive compounds and antioxidant activity present in three fruit species from the Brazilian Cerrado: carnauba (Copernicia prunifera (Mill.) H.E. Moore), murici (Byrsonima crassifolia L. Rich)and oiti (Licania tomentosa (Benth) Fritsch). Among analyzed fruits, oiti showed the highest total phenolic content (1236.42 ± 34.06 mg GAE 100 g-1) followed by murici (468.90 ± 27.30 mg GAE 100 g-1) and carnauba (314.44 ± 9.50 mg GAE 100 g-1). Regarding the antioxidant activity, murici showed 4350.31 ± 1.85 µmol TEAC.100 g-1 and oiti showed 14721.69 ± 0.85 µmol TEAC.100 g-1. In addition, high content of anthocyanins was verified in carnauba (9.35 ± 0.00 mg-cy-3-glu.100 g-1), as well as carotenoids...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Anthocyanins; Carotenoids; Phenolic compounds; Cerrado.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452019000300901

Bioactive micro-constituents of ackee arilli (Blighia sapida K.D. Koenig)
Provedor de dados: 42
Autores: GRANDE-TOVAR,CARLOS D.; JOHANNES,DELGADO-OSPINA; PUERTA,LUISA F.; RODRÍGUEZ,GLORIA C.; SACCHETTI,GIAMPIERO; PAPARELLA,ANTONELLO; CHAVES-LÓPEZ,CLEMENCIA.
Abstract: Ackee (Blighia sapida K. D. Koenig) is an exotic fruit widely consumed in the Caribbean countries. While there is extensive research on the presence of hypoglycin A, other bioactive compounds have not been studied. We identified and quantified the changes in bioactive molecules (total phenol, ascorbic acid, hypoglycin A, squalene, D: A-Friedooleanan-7-ol, (7.alpha.), and oleic acid), antioxidant potential, and volatile compounds during two stages of ripe. A clear reduction in hypoglycin A, ascorbic acid, and total polyphenols during the maturation process were observed. On the contrary, oleic acid, squalene, and D: A-Friedooleanan-7-ol, (7.alpha.) contents increased about 12, 12, and 13 times, respectively with advancing maturity. These bioactive...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Friedooleanan; Hypoglycin; Polyphenols; Squalene.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500616

Bioactive phytochemicals and antioxidant activity in fresh and dried lychee fractions1
Provedor de dados: 124
Autores: Queiroz,Estela de Rezende; Abreu,Celeste Maria Patto de; Oliveira,Kelly da Silva; Ramos,Vinicius de Oliveira; Fráguas,Rodrigo Martins.
Fruit of the lychee cv. Bengal are approximately 50% peel and seeds, which are discarded. These by-products have antioxidant compounds which are capable of blocking the harmful effects of free radicals in the body. Bioactive compounds (ascorbic acid, beta-carotene, lycopene and phenols) and antioxidant activity were evaluated in different extracts, both fresh and dried at 45 °C, of the skin, pulp and seeds of the lychee, which were subjected to principal component analysis to clarify which of the compounds are responsible for this activity. Principal component analysis explained 82.90% of the variance of the antioxidant profile of the lychee. The peel displayed higher levels of phenols, ascorbic acid, beta-carotene and antioxidant activity, while the seeds...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lychee; Antioxidants; Principal component analysis.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902015000100163

Biochemical and genetic alterations in the freshwater neotropical fish Prochilodus lineatus after acute exposure to Microcystis aeruginosa
Provedor de dados: 83
Autores: Garcia,Cylene Zambrozi; Martinez,Claudia B. R.
Microcystins are secondary metabolites produced by different species of cyanobacteria, such as Microcystis aeruginosa (MA). In this study, the biochemical and genetic effects of lyophilized MA were evaluated in the neotropical fish Prochilodus lineatus exposed to 1 or 2 mg L-1 lyophilized MA (treated group) or only water (control group) in static toxicity tests for 24 and 96 h. The gills and liver were used in the analysis of biotransformation enzymes and antioxidant defenses, blood and gill cells in genetic analysis and in brain and muscle it was determined the activity of acetylcholinesterase (AChE). The results showed the biotransformation pathway activation due to the increase in hepatic CYP1A and in branchial and hepatic glutathione S-transferase...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acetylcholinesterase; Antioxidants; Biotransformation; Cyanotoxin; DNA damage.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000300015

Biological applications of honeys produced by Apis mellifera
Provedor de dados: 48
Autores: Montenegro,Gloria; Mejías,Enrique.
Honey is a natural product with many attributes that are useful for humans. The consumption of honey is increasing because of its beneficial biological properties, including antioxidant and antibacterial activities. Even though honey is produced worldwide, many variants of this product have not been studied and their biological potential for alternative uses has not been evaluated. Because of its varied endemic native flora, Chile produces several types of honey. It is likely that these apian products have important biological properties inherited from specific floral sources, but it is absolutely necessary to conduct further chemical analyses to identify and characterize these biological attributes. Sadly, the potential antimicrobial and antitumor...
Tipo: Journal article
Palavras-chave: Honeys; Antioxidants; Natural Antibiotics; Environmental Bioindicator.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000400005

Biomass Accumulation, Photosynthetic Pigments, Osmotic Adjustments and Antioxidant Activities of Leymus chinensis in Response to BA, BR, and GA
Provedor de dados: 87
Autores: XUE-FENG,Z.; JUN,L.V.; SHAHID,M.; ANJUM,S.A.; NA-JIA,L.; XIU-JUAN,H.; YU,X.; XIAO,W.; SAN-GEN,W.
ABSTRACT: Abiotic stresses and poor biomass accumulation are chief constraints to accomplish potential yield in Leymus chinensis. An experiment was conducted to improve biomass and correlation of biomass accumulating attributes with photosynthetic pigments, osmotic substances and antioxidants under foliar application of different plant growth substances. The experiment was conducted at inner Mongolia Xilinguole, China, using a Randomized Complete Block Design and 5 replications. The treatments consisted of water (control); BA5 = application of BA (6-benzylaminopurine) at 5 mg L-1; BA25 = application of BA at 25 mg L-1; BA50 = application of BA at 50 mg L-1; BR0.02 = application of BR (brassinosteroid) at 0.02 g L-1; BR0.2 = application of BR at 0.2 mg L 1;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Reactive oxygen species; Phytoregulators.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100256

Caffeic acid improves cell viability and protects against DNA damage: involvement of reactive oxygen species and extracellular signal-regulated kinase
Provedor de dados: 56
Autores: Li,Y.; Chen,L.J.; Jiang,F.; Yang,Y.; Wang,X.X.; Zhang,Z.; Li,Z.; Li,L.
Hormesis is an adaptive response to a variety of oxidative stresses that renders cells resistant to harmful doses of stressing agents. Caffeic acid (CaA) is an important antioxidant that has protective effects against DNA damage caused by reactive oxygen species (ROS). However, whether CaA-induced protection is a hormetic effect remains unknown, as is the molecular mechanism that is involved. We found that a low concentration (10 μM) of CaA increased human liver L-02 cell viability, attenuated hydrogen peroxide (H2O2)-mediated decreases in cell viability, and decreased the extent of H2O2-induced DNA double-strand breaks (DSBs). In L-02 cells exposed to H2O2, CaA treatment reduced ROS levels, which might have played a protective role. CaA also activated the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caffeic acid; Hormesis; Antioxidants; DNA double-strand breaks; Extracellular signal-regulated kinase.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2015000600502

Callus induction and plant regeneration of Ulex europaeus
Provedor de dados: 69
Autores: Ramírez,Ingrid; Dorta,Fernando; Cuadros-Inostroza,Álvaro; Peña-Cortés,Hugo.
A callus induction and plant regeneration protocol was developed from leaf and thorn explants for the plant Ulex europaeus. Explants were incubated on 2% sucrose half-strength Murashige and Skoog Medium (MS) with various combinations of plant growth regulators and antioxidants. The best frequency of callus and shoot formation was obtained with 2,4-dichlorophenoxyacetic acid (2,4-D) 1 mg/l x kinetin (Kin) 0.2 mg/l (DK Medium; callus induction) and zeatin (Z) 1 mg/l (DK medium; shoot induction). Both media were supplemented with ascorbic acid 200 mg/l to prevent browning and death of the explants. The regenerated shoots transferred to rooting medium (half-strength MS Medium, 2% sucrose) showed rapid growth and development of roots (100%). Rooted plantlets...
Tipo: Journal article
Palavras-chave: Antioxidants; Callus induction; Fabaceae; Gorse; Plant regeneration; Ulex europaeus.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000400007

(+)-Catechin and (-)-epigallocatechin gallate: are these promising antioxidant therapies for frozen goat semen?
Provedor de dados: 45
Autores: Silva,E.C.B.; Arruda,L.C.P.; Vieira,J.I.T.; Soares,P.C.; Guerra,M.M.P.
ABSTRACT The aim of this study was to evaluate the effects of different concentrations of (+)-catechin or (-)-epigallocatechin gallate (EGCG) on goat semen freezability. Poolsof semen were processed (Experiment 1: 0, 15, 25, 50, 75, or 100µM (+)-catechin; Experiment 2: 0, 15, 25, 50, 75, or 100µM EGCG) and frozen. After thawing, the samples were evaluated for kinematics, plasma membrane (PMi) and acrosome integrity, morphology, and oxidative stress, at 0 and 1h. In Experiment 1, at 0h, VSL and VAP were greater (P&lt;0.05) with 15µM than with 50 and 100; WOB was lower (P&lt;0.05) with 100µM than with 0, 15, and 25; and BCF was higher (P&lt;0.05) with 75 and 100µM than with 0. In turn, in Experiment 2, progressive motility was higher (P&lt;0.05) with0 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Cryopreservation; Flavonoids; Oxidative stress; Semen.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352019000200521

Changes in growth, pigment content and antioxidants in the root and leaf tissues of wheat plants under the influence of exogenous salicylic acid
Provedor de dados: 61
Autores: Sahu,Gopal Krishna; Sabat,Surendra Chandra.
The effect of various concentrations of salicylic acid (SA) on the growth, pigment content and the activity of antioxidants was investigated in the laboratory grown wheat plants. The root and shoot growth was affected at higher concentration of SA in early days of growth. The activities of catalase (CAT), ascorbate peroxidase (APX) and guaicol-specific peroxidase (POX) declined with the application of SA (50, 500 and 1000 µM), the decrease being more pronounced with the increase in SA concentrations both in the root and leaf tissues. On the other hand superoxide dismutase (SOD) activity increased with the application of SA. At low concentrations, SA has no effect on the activities of these enzymes in vitro. Salicylic acid at higher concentrations (5- and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Oxidative stress; Salicylic acid; Triticum aestivum L.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202011000300005

Changes in nitrate reductase activity and oxidative stress response in the moss Polytrichum commune subjected to chromium, copper and zinc phytotoxicity
Provedor de dados: 61
Autores: Panda,Sanjib Kumar; Choudhury,Shuvasish.
The main aim of this paper was to investigate the effect of chromium (Cr), copper (Cu) and zinc (Zn) on nitrate reductase (NR) activity and oxidative stress responses in the moss Polytrichum commune. Cr, Cu and Zn resulted in the inhibition of NR activity. A decline in total chlorophyll content was observed after 24 and 48 h of metal treatment. Accumulation of the metals showed a dose and time dependent increase. High accumulation of Cu, Cr and Zn were seen in moss shoots after 24 and 48 h of treatment. Treatment of Cr, Cu and Zn for 24 or 48 h resulted in the increase of malondialdehyde (MDA) content in moss shoots. The highest increase was observed in shoots under Cu treatment followed by Cr and Zn. The MDA content was significantly higher after 48h....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Chromium; Copper; Malondialdehyde; Nitrate reductase; Oxidative stress; Polytrichum commune; Zinc.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202005000200001

Characterization of Seed Oils of Pterodon emarginatus Vogel (Sucupira) Obtained by Different Extraction Methods
Provedor de dados: 52
Autores: Costa-Singh,Tainara; Jorge,Neuza.
Abstract The present study aims to evaluate the influence of extraction methods on the quality of bioactive compounds and antioxidant capacity in Pterodon emarginatusVogel (sucupira) oils. The oils were extracted from the sucupira seeds by Soxhlet and by the extraction system of Bligh &amp; Dyer. The oils were analyzed as to fatty acid profile, tocopherols, phytosterols, carotenoids, total phenolics, and total antioxidant capacity. The extraction by Soxhlet showed better yield of total lipids and was more efficient to extract tocopherols, phytosterols, and carotenoids, besides presenting better antioxidant activity by DPPH•. However, this method showed insufficient capacity to extract the polar lipid components of the sample, as evidenced by the low...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Bioactives; Extraction; Oxidative stability; Chromatography.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000100506

Chromium stress in plants
Provedor de dados: 61
Autores: Panda,S.K.; Choudhury,S.
The article presents an overview of the mechanism of chromium stress in plants. Chromium is known to be a toxic metal that can cause severe damage to plants and animals. Chromium-induced oxidative stress involves induction of lipid peroxidation in plants that causes severe damage to cell membranes. Oxidative stress induced by chromium initiates the degradation of photosynthetic pigments causing decline in growth. High chromium concentration can disturb the chloroplast ultrastructure thereby disturbing the photosynthetic process. Like copper and iron, chromium is also a redox metal and its redox behaviour exceeds that of other metals like Co, Fe, Zn, Ni, etc. The redox behaviour can thus be attributed to the direct involvement of chromium in inducing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Chromium; Fenton reactions; Metallothioneins; Oxidative stress.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202005000100008

Comparison of the antioxidant potential of antiparkinsonian drugs in different in vitro models
Provedor de dados: 60
Autores: Farias,Carine Coneglian de; Bonifácio,Kamila Landucci; Matsumoto,Andressa Keiko; Higachi,Luciana; Casagrande,Rúbia; Moreira,Estefânia Gastaldello; Barbosa,Décio Sabbatini.
Parkinson's disease (PD) is characterized by progressive degeneration of dopaminergic neurons in the substantia nigra pars compacta. Furthermore, oxidative stress plays a role in PD, causing or contributing to the neurodegenerative process. Currently PD has only symptomatic treatment and still nothing can be done to stop the degenerative process of the disease. This study aimed to comparatively evaluate the antioxidant capacity of pramipexole, selegeline and amantadine in different in vitrostudies and to offer possible explanations on the molecular antioxidant mechanisms of these drugs. In vitro, the antioxidant capacity of the drugs was assessed by the ability of antiparkinsonian drugs to decrease or scavenge ROS in the neutrophil respiratory burst,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Parkinson´s disease; Oxidative stress; Antiparkinsonian drugs/in vitrostudies; Antioxidants.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502014000400819

Contribución al conocimiento del árbol de cirián (Crescentia alata Kunth.) variabilidad, selección, morfología, citogenética y fitoquímica.
Provedor de dados: 32
Autores: Peralta Valverde, Gabriel.
El cirián es un árbol medicinal con frutos esféricos que contiene iridoides y polifenoles los que confieren propiedades anti-inflamatorias, antioxidantes y antimicrobianas. La presente investigación se realizó en la región de Tierra Caliente, Michoacán, México en la Depresión del Balsas, la cual es uno de los refugios pleistocénicos más extensos de Norteamérica y centro de origen y domesticación del maíz; el árbol de cirián, es una especie emblemática de esta región y probablemente constituyó una fuente importante de alimento para los grupos humanos que colonizaron el centro-occidente de México hace más de treinta mil años. Los frutos de cirián partidos por la mitad sirven como recipientes que debieron ser de gran utilidad para el Hombre Temprano en México...
Palavras-chave: Depresión del Balsas; Compuestos fenólicos; Antioxidantes; Selección; Número cromosómico; Balsas Basin; Phenolics compounds; Antioxidants; Selection; Chromosome number; Genética; Doctorado.
Ano: 2012
URL: http://hdl.handle.net/10521/749

Cyclic nitroxides inhibit the toxicity of nitric oxide-derived oxidants: mechanisms and implications
Provedor de dados: 42
Autores: Augusto,Ohara; Trindade,Daniel F.; Linares,Edlaine; Vaz,Sandra M.
The substantial therapeutic potential of tempol (4-hydroxy-2,2,6,6-tetramethyl-1-piperidinyloxy) and related cyclic nitroxides as antioxidants has stimulated innumerous studies of their reactions with reactive oxygen species. In comparison, reactions of nitroxides with nitric oxide-derived oxidants have been less frequently investigated. Nevertheless, this is relevant because tempol has also been shown to protect animals from injuries associated with inflammatory conditions, which are characterized by the increased production of nitric oxide and its derived oxidants. Here, we review recent studies addressing the mechanisms by which cyclic nitroxides attenuate the toxicity of nitric oxidederived oxidants. As an example, we present data showing that tempol...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyclic nitroxides; Tempol; Antioxidants; Nitric oxide-derived oxidants; Inflammation; Acetaminopheninduced hepatotoxicity.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000100013

Effect of cooking on the bioactive compounds and antioxidant activity in grains cowpea cultivars
Provedor de dados: 124
Autores: Barros,Nara Vanessa dos Anjos; Rocha,Maurisrael de Moura; Glória,Maria Beatriz Abreu; Araújo,Marcos Antônio da Mota; Moreira-Araújo,Regilda Saraiva dos Reis.
ABSTRACT The present study evaluated the effect of cooking on the levels of bioactives compounds and antioxidant activity in grains cowpea cultivars. The analysis were performed on the raw samples and after cooking in pressure cooker. Regarding the bioactive compounds present, the grain cultivar BRS Aracê exhibited the highest levels of total phenolic compounds (mg/100 g) both before and after cooking, 205.10 ± 2.89 and 150.62 ± 2.64, respectively. Spermine and spermidine were identified in the cultivars (mg/kg) BRS Milênio in the amount of 120.5 in crude and 50.4 in cooked grain, in the BRS Tumucumaque in the amount of 116.2 in crude and 47.9 in cooked grain, exhibited significant losses of these compounds after cooking. It was not detected the presence...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vigna unguiculata; Functional food; Antioxidants; Processing.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000500824

Effect of dried extract of boldo (Peumus Boldus Mol.) on growth and oxidative tissue status of broiler chickens
Provedor de dados: 89
Autores: Fellenberg,MA; Delporte,C; Backhouse,N; Peña,I; Speisky,H.
The addition of antioxidants to broiler diets has been shown to enhance their antioxidant status. Since boldo (Peumus boldus Mol.) leaves contain highly antioxidant molecules, a dried extract of boldo (DEB) was added to broiler diets to improve "in vivo" antioxidant tissue status and to favor animal growth. A DEB standardized for antioxidant content was prepared and added to poultry diets at three different levels (low-DELB, medium-DEMB, and high-DEHB) for a period of 6 weeks. A single negative control (no added antioxidant) and one positive control (supplementation with 200 mg/kg vitamin E) were used. Plasma antioxidant capacity (PAC), thiol content (GHS), and basal and induced lipoperoxidation of liver, leg and breast tissues were determined in birds at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Boldo; Broiler; Oxidative stress.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2008000400009

Effect of Harvest Time and L-Cysteine as an Antioxidant on Flesh Browning of Fresh-Cut Cherimoya (Annona cherimola Mill.)
Provedor de dados: 117
Autores: Campos-Vargas,Reinaldo; Defilippi,Bruno G; Romero Q,Paula; Valdés G,Héctor; Robledo M,Paula; Prieto E,Humberto.
Browning development is the most important factor limiting the quality of fresh-cut cherimoya (Annona cherimola Mill.). However, there is little information available about its causes and methods of control. The effectiveness of L-cysteine (0.125, 0.25 and 0.5%) in fresh-cut cherimoya harvested on two occasions (October and November) and stored for 6 and 12 days at 0 °C was studied. In order to understand the biological basis of browning, polyphenol oxidase (PPO) enzyme activity and total phenolic content in fresh-cut pieces were measured. Quality measurements and sensory analysis indicated that 0.5% L-cysteine was somewhat effective in reducing browning development, without affecting other quality attributes. In terms of physiological parameters, PPO...
Tipo: Journal article
Palavras-chave: Antioxidants; Polyphenol oxidase; Phenolics; Sensorial evaluation.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000300001

Effect of methionine load on homocysteine levels, lipid peroxidation and DNA damage in rats receiving ethanol
Provedor de dados: 60
Autores: Jordao Júnior,Alceu Afonso; Domenici,Fernanda Aparecida; Lataro,Renata Cristina; Portari,Guilherme Vannucchi; Vannucchi,Helio.
Changes in the metabolism of methionine can cause hyperhomocysteinemia, inducing a triad of atherosclerosis, hypertension, and increased oxidative stress. The generation of free radicals and oxidative damage to DNA is important in the liver damage caused by ethanol. In this study, the effect of methionine overload associated or otherwise with acute administration of ethanol on homocysteine values, damage to DNA, lipoperoxidation and vitamin E was evaluated. Thirty rats were divided into 3 groups: Group Ethanol 24 hours (EG24), Group Methionine 24 hours (MG24), and Group Methionine and Ethanol 24 hours (MEG24). TBARS, vitamin E, GS and, homocysteine values were determined and the Comet assay was carried out. Increased GSH, vitamin E and homocysteine levels...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Methionine; Homocysteine; Free Radicals; Antioxidants; Ethanol/induced damage.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502009000400014

Effect of nitric oxide and plant antioxidants on microsomal content of lipid radicals
Provedor de dados: 48
Autores: BOVERIS,ALEJANDRO D; GALATRO,ANDREA; PUNTARULO,SUSANA.
The antioxidant ability of nitric oxide (NO) generated by a chemical donor and of commercially available antioxidant preparations was assayed. SNAP (S-Nitroso-N-acetylpenicilamine) was used as the NO donor, and Ginkgo biloba, wheat and alfalfa preparations were tested. Lipid peroxidation was assayed by EPR employing a reaction system consisting of rat liver microsomes, ADP, FeCl3, NADPH and POBN in phosphate buffer, pH=7.4. In vitro NO exposure decreased microsomal lipid peroxidation in a dose-dependent manner. The dose responsible for inhibiting the microsomal content of lipid radical adducts by 50% (LD50) for SNAP was 550 mu M (NO generation rate 0.1 mu M/min). The addition of 50 mM hemoglobin to the incubation media prevented NO effect on lipid...
Tipo: Journal article
Palavras-chave: Antioxidants; Nitric oxide; Plants extracts; Lipid radicals.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000200016

Effect of organic tomato ( Lycopersicon esculentum ) extract on the genotoxicity of doxorubicin in the  Drosophila  wing spot test
Provedor de dados: 74
Autores: Dutra,Elaine S.; Dias,Cristina D.; Araújo,Bethânia C. de; Castro,Antônio J. S.; Nepomuceno,Júlio C.
The consumption of organic tomatoes (ORTs) reduces the risk of harmful effects to humans and the environment caused by exposure to toxic agrochemicals. In this study, we used the somatic mutation and recombination test (SMART) of wing spots in  Drosophila melanogaster  to evaluate the genotoxicity of ORT and the effect of cotreatment with ORT on the genotoxicity of Doxorubicin ®  (DXR, a cancer chemotherapeutic agent) that is mediated by free radical formation. Standard (ST) cross larvae were treated chronically with solutions containing 25%, 50% or 100% of an aqueous extract of ORT, in the absence and presence of DXR (0.125 mg/mL), and the number of mutant spots on the wings of emergent flies was counted. ORT alone was not genotoxic but enhanced the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Co-genotoxicity; Drosophila melanogaster; Organic tomato; SMART.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000100020

Effect of the Cooling System and 1-MCP on the Incidence of Superficial Scald in ‘Granny Smith’ Apples
Provedor de dados: 117
Autores: Moggia,Claudia; Hernández,Omar; Pereira,Marcia; A. Lobos,Gustavo; Yuri,José Antonio.
A study was carried out to determine the effects of two cooling systems and the application of 1-methylcyclopropene (1-MCP, SmartFreshTM) on the incidence of superficial scald in apples (Malus domestica Borkh.) cv. Granny Smith. Fruit were collected from a commercial orchard (Colbún, Maule Region, Chile) during 2004-2005 season. A completely randomized design was used in a 2 x 2 factorial arrangement, using cooling systems (normal and step-wise cooling) and application of 1-MCP (0 and 625 nL L-1 i.a.) as the main factors. Fruit from normal cooling were kept at 0 °C throughout the storage period (180 days). Step-wise cooling consisted of storing the fruit at 10 °C for 10 days; 4 °C for the next 20 days and 0 °C for the remaining 150 days. Every month,...
Tipo: Journal article
Palavras-chave: Conjugated trienes; Antioxidants; -farnesene; 1-methylcyclopropene; Physiological disorder; Ethylene.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000300011

Efluente y té de vermicopost en la producción de hortalizas de hoja en sistema NFT.
Provedor de dados: 32
Autores: González Solano, Karla Daniela.
El objetivo de la presente investigación fue determinar la calidad nutrimental del efluente y té de vermicompost en la producción de hortalizas de hoja producidas bajo un sistema NFT (Nutrient Film Technique). Para cumplir el objetivo se llevaron a cabo cinco investigaciones donde se  incluye desde identificar el origen del vermicompost, las características químicas ideales para obtener un té de vermicompost hasta su evaluación nutrimental en hortalizas y aromáticas. Los resultados obtenidos muestran que el origen del vermicompost influyó sobre el pH y CE, el lavado previo del vermicompost disminuyó la CE aunque no modificó el valor de pH; a mayor relación vermicompost:agua se incrementó pH  la CE y contenido nutrimental, la misma tendencia se observó para...
Palavras-chave: Extractos orgánicos; Nutrientes; Producción orgánica; Antioxidantes; Indices de crecimiento; Organic extracts nutrients; Organic production; Antioxidants; Growth rates; Edafología; Maestría.
Ano: 2013
URL: http://hdl.handle.net/10521/2023

Egg quality during storage and deposition of minerals in eggs from quails fed diets supplemented with organic selenium, zinc and manganese
Provedor de dados: 96
Autores: Gravena,Rodrigo Antonio; Marques,Rafael Henrique; Roccon,Josiane; Picarelli,Juliana; Hada,Fabricio Hirota; Silva,Janaina Della Torre da; Queiroz,Sandra Aidar de; Moraes,Vera Maria Barbosa de.
Three experiments with Japanese laying quails were performed aiming to assess the effect of supplementation with minerals in organic form on the egg quality during storage and the deposition of minerals in eggs. The assessments of each experiment were related to one mineral, thus, experiment 1 assessed the supplementation with selenium in 0.35-, 0.70- and 1.05-mg/kg levels of feed; experiment 2, the supplementation with zinc in 50-, 100- and 150-mg/kg levels of feed; and experiment 3, the supplementation of manganese with 60-; 120- and 180-mg/kg levels of feed. All diets were evaluated compared with a control diet without mineral supplementation. Birds were distributed in a completely randomized experimental design, with eight birds per plot and six...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Coturnix coturnix japonica; Enrichment of eggs; Japanese quail; Organic minerals.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011001200022

Endothelial cell oxidative stress and signal transduction
Provedor de dados: 48
Autores: FONCEA,ROCIO; CARVAJAL,CRISTIAN; ALMARZA,CAROLINA; LEIGHTON,FEDERICO.
Endothelial dysfunction (ED) is an early event in atherosclerotic disease, preceding clinical manifestations and complications. Increased reactive oxygen species (ROS) have been implicated as important mechanisms that contribute to ED, and ROS’s may function as intracellular messengers that modulate signaling pathways. Several intracellular signal events stimulated by ROS have been defined, including the identification of two members of the mitogen activated protein kinase family (ERK1/2 and big MAP kinase, BMK1), tyrosine kinases (Src and Syk) and different isoenzymes of PKC as redox-sensitive kinases. ROS regulation of signal transduction components include the modification in the activity of transcriptional factors such as NFkB and others that result in...
Tipo: Journal article
Palavras-chave: Oxidative stress; Signal transduction; Gene expression; Endothelial cell; Atherosclerosis; Antioxidants.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000200008

Especies novedosas de champiñones (Agaricus) con propiedades funcionales antioxidantes y antimicrobianas, aisladas de zonas rurales de México.
Provedor de dados: 32
Autores: Cruz Romero, Elizabeth.
México cuenta con una gran diversidad biológica, sin embargo, poco se han aprovechado los recursos genéticos nativos para la producción comercial de hongos comestibles. Los champiñones, son los hongos comestibles más comercializados en el mercado mexicano para lo cual se usan cepas extranjeras. La presente investigación se inició con el estudio preliminar de 15 cepas nativas de México de Agaricus spp. Dado que la investigación requería de biomasa micelial, al final solo se trabajó con dos cepas de Agaricus spp. (CP-83 y CP-89). Al micelio de estas cepas se les determinaron antioxidantes y pruebas antimicrobianas. Estas pruebas se realizaron de macerados y extractos acuosos y etanólico. La prueba antimicrobiana se realizo con una cepa de E. coli (CPB-8). En...
Palavras-chave: Agaricus; Micelio; Cultivo de hongos comestibles; Antioxidantes; Antimicrobianos; E. coli; Agaricus mycelia; Cultivation of edible mushrooms; Antimicrobials; EDAR; Estrategias para el Desarrollo Agrícola Regional; Maestría; Antioxidants.
Ano: 2012
URL: http://hdl.handle.net/10521/675

Ethanol Intake and Toxicity: In Search of New Treatments
Provedor de dados: 77
Autores: Sandoval,Cristian; Vásquez,Bélgica; Mandarim-de-Lacerda,Carlos; del Sol,Mariano.
Prolonged alcohol consumption has consequences on the liver, producing necrotic precipitates and fibrosis, on the pancreas, causing the pancreatic acini to atrophy and destroying insulin-producing cells, and on the central nervous system (CNS), causing the gray and white matter in the frontal lobes of the brain and cerebellum to atrophy. Generally, alcohol is metabolized via oxidative pathways, where the enzymes alcohol dehydrogenase and aldehyde dehydrogenase participate during its metabolization in the liver and CNS, or via non-oxidative pathways during its metabolization in the pancreas. Ethanol metabolism can produce oxidative stress and tissue damage mediated by free radicals, causing morphological and functional alterations in the liver. In the...
Tipo: Journal article
Palavras-chave: Antioxidants; Ethanol; Liver; Pancreas; Central nervous system.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000300024

Evaluation of oxidative status in patients with brucellosis
Provedor de dados: 55
Autores: Serefhanoglu,Kivanc; Taskin,Abdullah; Turan,Hale; Timurkaynak,Funda Ergin; Arslan,Hande; Erel,Ozcan.
Oxidative stress can be defined as an increase in oxidants and/or a decrease in antioxidant capacity. We aimed to determine total antioxidant capacity (TAC), total peroxide, malondialdehyde and catalase levels in plasma samples, and calculation of oxidative stress index (OSI) in patients with brucellosis to evaluate their oxidative status using a novel automated method. Sixty-nine patients with brucellosis and 69 healthy control subjects were included in the present study. Plasma levels of total peroxide and malondialdehyde were significantly increased in patients as compared with healthy controls (p&lt;0.001 and p&lt;0.001, respectively). In contrast, TAC level was significantly lower in patients as compared with controls (p&lt;0.001). There was no...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Brucellosis; Oxidants; Antioxidants; Oxidative stress.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702009000400001

Functional Foods in the Marketplace: Willingness to Pay for Apples Enriched with Antioxidants
Provedor de dados: 31
Autores: Markosyan,   Armenak; Wahl,   Thomas I.; McCluskey,   Jill J.
The attention on so-called “functional foods” has been growing as consumers become more concerned with diet and nutrition. This article aims to measure consumers’ response to apples with “naturally enriched antioxidant coatings.” Surveys were conducted in grocery stores in Seattle, Washington and Spokane, Washington. The results suggest that consumers have a somewhat positive attitude towards functional foods in general and with apples enriched with antioxidants in particular. A contingent valuation technique was used to assess factors affecting consumers’ willingness to pay for the apples with antioxidant coatings. Consumers in the Spokane grocery stores are more likely to pay a premium for the new type of apples than consumers in Seattle. Consumers who...
Tipo: Conference Paper or Presentation
Palavras-chave: Functional food; Willingness to pay; Antioxidants; Demand and Price Analysis; Health Economics and Policy.
Ano: 2007
URL: http://purl.umn.edu/9787

Genetic and chemical characterization of avocado commercial cultivars avocado of Risaralda Colombia
Provedor de dados: 94
Autores: Álvarez,Gloria Edith Guerrero; Gutiérrez,Ana María López; Valencia,Katalina Ángel; Mossos,Paula Sandoval; Rozo,Diana Lucía Suárez; Hurtado,Nathalia Cardona.
Abstract  This research aimed at performing the molecular characterization of commercial Papelillo avocado (Persea americana cv Lorena) cultivars from the municipality of Marsella (Risaralda, Colombia), as well as the physicochemical analysis and antioxidant activity assessment of the pulp and seed. An evaluation of 50 individuals among commercial varieties and possible patterns was performed using 17 microsatellite markers. Proximate analysis of the pulp was performed, and the fatty acid profile of oils, the antioxidant activity by the DPPH and FRAP methods, and the total phenolic content were evaluated. From the cluster analysis, Dice index, and Principal Coordinates Analysis, it became evident that all the individuals showed a tendency to group by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; DNA; Fatty acids; Microsatellites; Persea americana Mill.; Total phenols.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452020000500902

In vitro antioxidant capacity and free radical scavenging evaluation of active metabolite constituents of Newbouldia laevis ethanolic leaf extract
Provedor de dados: 48
Autores: Habu,Josiah Bitrus; Ibeh,Bartholomew Okechukwu.
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Tipo: Journal article
Palavras-chave: Newbouldia laevis; Phytochemicals; Ethanolic extraction; Antioxidants; Free radical scavengers; Bioactive constituents.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100016

Influence of wheat straw and rhizosphere on seed germination, early seedling growth and bio-chemical attributes of Trianthema portulacastrum
Provedor de dados: 87
Autores: Khaliq,A; Matloob,A; Aslam,F; Bismillah Khan,M.
Decomposing wheat (Triticum aestivum) straw and rhizosphere-infested soil were evaluated for their suppressive activity against horse purslane (Trianthema portulacastrum), a noxious summer weed in Pakistan. Two separate pot studies were carried out. Wheat straw was incorporated at 4, 6 and 8 g kg-1 soil five days before the sowing of horse purslane. Pots without straw incorporation were maintained as control. In a second study, soil was taken from 15 and 30 cm depths from a previously cropped wheat field immediately after its harvest and was used as growing medium. Soil from an intentionally uncropped area of the same field was used as control. Suppressive activity was measured in terms of germination dynamics, seedling growth, and biochemical attributes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allelopathic rhizosphere; Chlorophyll; Phenolics; Antioxidants.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582011000300006

Influences of alpha-tocopherol on cholesterol metabolism and fatty streak development in apolipoprotein E-deficient mice fed an atherogenic diet
Provedor de dados: 56
Autores: Peluzio,M.C.G.; Homem,A.P.P.; Cesar,G.C.; Azevedo,G.S.; Amorim,R.; Cara,D.C.; Saliba,H.; Vieira,E.C.; Arantes,R.E.; Alvarez-Leite,J.
Although the role of oxidized lipoproteins is well known in atherogenesis, the role of vitamin E supplementation is still controversial. There is also little information about cholesterol metabolism (hepatic concentration and fecal excretion) in the new models of atherosclerosis. In the present study, we evaluated the effect of moderate vitamin E supplementation on cholesterol metabolism and atherogenesis in apolipoprotein E (apo E)-deficient mice. Apo E-deficient mice were fed an atherogenic diet containing 40 or 400 mg/kg of alpha-tocopherol acetate for 6 weeks. Total cholesterol in serum and liver and 3-OH-alpha-sterols in feces, and fecal excretion of bile acids were determined and histological analyses of aortic lesion were performed. A vitamin E-rich...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Atherosclerosis; Apo E; Mice; Alpha-tocopherol; Cholesterol.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001001200005

Inhibition of LDL-oxidation and antioxidant properties related to polyphenol content of hydrophilic fractions from seaweed Halimeda Incrassata (Ellis) Lamouroux
Provedor de dados: 60
Autores: Costa-Mugica,Ariana; Batista- Gonzalez,Ana Elsa; Mondejar,Diadelis; Soto-López,Yosdel; Brito-Navarro,Victor; Vázquez,Ana Maria; Brömme,Dieter; Zaldívar-Muñoz,Claudina; Vidal-Novoa,Alexis; Silva,Ana Mara de Oliveira e; Mancini-Filho,Jorge.
LDL oxidation and oxidative stress are closely related to atherosclerosis. Therefore, natural antioxidants have been studied as promising candidates. In the present study, the LDL oxidation inhibition activity of bioactive compounds from Halimeda incrassata seaweed. associated to antioxidant capacity, was evaluated in vitro. Experimental work was conducted with lyophilized aqueous extract and phenolic-rich fractions of the seaweed and their effect on LDL oxidation was evaluated using heparin-precipitated LDL (hep-LDL) with exposure to Cu2+ ions and AAPH as the free radical generator. H. incrassata had a protective effect for hep-LDL in both systems and the presence of phenolic compounds contributed to the activity where phenolic-rich fractions showed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Halimeda incrassata/antioxidant properties; Antioxidants; Polyphenols; Lipoproteins/oxidation inhibition.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502012000100004

Inhibition of proteases and phospholipases A2 from Bothrops atrox and Crotalus durissus terrificus snake venoms by ascorbic acid, vitamin E, and B-complex vitamins
Provedor de dados: 42
Autores: OLIVEIRA,CARLOS H.M.; SIMÃO,ANDERSON A.; TRENTO,MARCUS V.C.; CÉSAR,PEDRO H.S.; MARCUSSI,SILVANA.
ABSTRACT The enzyme inhibition by natural and/ or low-cost compounds may represent a valuable adjunct to traditional serotherapy performed in cases of snakebite, mainly with a view to mitigate the local effects of envenoming. The objective of this study was to evaluate possible interactions between vitamins and enzymes that comprise Bothrops atrox and Crotalus durissus terrificus venoms, in vitro. Proteolysis inhibition assays (substrates: azocasein, collagen, gelatin and fibrinogen), hemolysis, coagulation, hemagglutination were carried out using different proportions of vitamins in face of to inhibit minimum effective dose of each venom. The vitamins were responsible for reducing 100% of breaking azocasein by C.d.t. venom, thrombolysis induced by B....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antiophidian properties; Antioxidants; Blood cells; Hemostatic processes; Natural inhibitors.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000502005

Investigation on the in vitro antioxidant capacity of methanol extract, fractions and flavones from Oroxylum indicum Linn bark
Provedor de dados: 60
Autores: Trang,Do Hoang Thu; Son,Hoang Le; Trung,Phung Van.
ABSTRACT Antioxidants from natural sources hold high values regarding their indispensible roles in the development of nutraceuticals, pharmaceuticals and cosmetic products. Oroxylum indicum L. is a common medicinal plant with a wide range of therapeutic properties, including a notable antioxidant potency that was reported, yet has not been subjected to more detailed studies. The present study evaluated the potency of Oroxylum indicum methanol stem bark extract, along with its hexane, ethyl acetate, methanol fractions, three flavones including baicalein, oroxylin A and chrysin using DPPH assay. In terms of IC50 values, the crude extract (65,48 μg/mL) exhibited moderate inhibitory activity which was as half potent as that of its ethyl acetate fraction (32,94...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oroxylum indicum; Flavones; Methanol/extract; DPPH assay; Antioxidants; Inhibitory Concentration 50; Bignoniaceae.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502018000100619

Lipid peroxidation and antioxidants in hyperlipidemia and hypertension
Provedor de dados: 48
Autores: MORIEL,PATRICIA; PLAVNIK,FRIDA L; ZANELLA,MARIA T; BERTOLAMI,MARCELO C; ABDALLA,DULCINEIA SP.
Lipid peroxidation and lipid-derived oxidized products have been implicated in the pathogenesis of a variety of human diseases. To clarify the role of oxidative stress in essential hypertension and hypercholesterolemia the in vitro oxidative susceptibility of LDL, the antioxidant status and the lipid peroxide content of blood plasma were examined in hypercholesterolemic (HC), hypertensive (H), hypercholesterolemic/hypertensive (HH) and normolipidemic/normotensive subjects (N). Plasma ascorbate and lipid-soluble antioxidants were lower, while LDL oxidizability, CE-OOH and TL-OOH were higher in H, HC, and HH groups than in the N group. No difference was observed among groups for PL-OOH and isoprostanes. In summary, the results show that: 1) lipid- and...
Tipo: Journal article
Palavras-chave: Lipoprotein oxidation; Lipid peroxides; Isoprostanes; Antioxidants; Atherosclerosis; Oxidative stress.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000200010

Lipoic acid, but not tempol, preserves vascular compliance and decreases medial calcification in a model of elastocalcinosis
Provedor de dados: 56
Autores: Bassi,E.; Liberman,M.; Martinatti,M.K.; Bortolotto,L.A.; Laurindo,F.R.M.
Vascular calcification decreases compliance and increases morbidity. Mechanisms of this process are unclear. The role of oxidative stress and effects of antioxidants have been poorly explored. We investigated effects of the antioxidants lipoic acid (LA) and tempol in a model of atherosclerosis associated with elastocalcinosis. Male New Zealand white rabbits (2.5-3.0 kg) were fed regular chow (controls) or a 0.5% cholesterol (chol) diet+104 IU/day vitamin D2 (vitD) for 12 weeks, and assigned to treatment with water (vehicle, n=20), 0.12 mmol·kg-1·day-1 LA (n=11) or 0.1 mmol·kg-1·day-1 tempol (n=15). Chol+vitD-fed rabbits developed atherosclerotic plaques associated with expansive remodeling, elastic fiber disruption, medial calcification, and increased...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Vascular calcification; Atherosclerosis; Oxidative stress; Lipoic acid.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2014000200119

Memory retrieval improvement by Heteropterys aphrodisiaca in aging rats
Provedor de dados: 60
Autores: Galvão,Suzana Maria Pereira; Mendes,Fúlvio Rieli; Oliveira,Maria Gabriela Menezes de; Mattei,Rita; Mello,João Carlos Palazzo de; Roman Júnior,Walter Antonio; Carlini,Elisaldo de Araújo.
Few data exists about the pharmacological properties of Heteropterys aphrodisiaca O. Mach. (Malpighiaceae), which is native to the scrubland regions of Brazil. The present study investigated the effects of oral treatment with H. aphrodisiaca extract (BST0298) on the learning and memory of young (3-6 months) and aged (21-23 months) rats, and compared the in vitro antioxidant activity of three lots collected in different years. An improvement in the number of sessions to learn the task was observed in the left/right discrimination test in aged rats treated for 45 days with 25 mg/kg (7.0 ± 0.5; p=0.005) or 50 mg/kg (7.6 ± 0.6; p=0.012) compared with control old rats (11.0 ± 1.6). On the other hand, pre-treatment did not improve the performance of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heteropterys aphrodisiaca O. Mach/pharmacognosy; Heteropterys aphrodisiaca O. Mach/antioxidant activity; Malpighiaceae/pharmacognosy; Antioxidants; Flavonoids; Plant extract.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502011000400020

Natural and synthetic pigments in diet of Japanese quails
Provedor de dados: 2
Autores: Valentim, jean kaique; Bittencourt, Tatiana Marques; Lima, Heder José D'Àvilla; Barros, Fernanda Keller Queiroz; Almeida, Guilherme Resende de; Ziemniczak,  Henrique Momo.
The objective of this study was to evaluate productive performance and egg quality of Japanese quails (Cortunix japonica) fed with synthetic and natural pigments. The treatments used were: 0.8% paprika extract (Capsicum annuum), 0.8% marigold flower extract, 4% paprika extract and 4% marigold flower extract and 0.045% synthetic pigment (Canthaxanthin) in feed. A total of 240 Japanese quails at 20 weeks of age were distributed in a completely randomized experimental design with five treatments and six replicates, with eight quails per experimental unit (30 experimental units). There was no difference (p &amp;gt; 0.05) for the evaluated parameters, except for yolk color which showed significant difference (p &amp;lt; 0.05) between the treatments used. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Canthaxanthin; Yolk color; Plant extracts.
Ano: 2020
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/47364

Natural gaps associated with oxidative stress in Willisornis poecilinotus (Aves: Thamnophilidae) in a tropical forest
Provedor de dados: 36
Autores: Gomes,Andreza de Lourdes Souza; Gonçalves,Andrey Felipe Gomes; Vieira,José Luiz Fernandes; Marceliano,Maria Luiza Videiro; Silva,José Maria Cardoso da.
Natural disturbances in tropical forests modify the availability and quality of resources and alter the patterns of bird distribution. These environmental changes increase the metabolic rate and disrupt the redox balance promoting oxidative stress. This study aimed to compare the abundance of Willisornis poecilinotus between gaps and the understory of a forest with undisturbed canopy at Caxiuanã National Forest. The abundance was correlated with vegetation heights. The oxidative stress and the stress promoting factors were determined in both sites of sampling. We captured 81 specimens of W. poecilinotus. The number of captures was high in gaps. The specimens sampled at gaps showed high levels of oxidative stress. The biomarkers of oxidative stress were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Environmental disturbances; Redox balance; Lipid peroxidation.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672014000200006

Nitric Oxide: Oxygen Radical Interactions in Atherosclerosis
Provedor de dados: 48
Autores: RUBBO,HOMERO; BATTHYANY,CARLOS; RADI,RAFAEL.
Atherosclerosis is one of the most common diseases and the principal cause of death in western civilization. The pathogenesis of this disease can be explained on the basis of the ‘oxidative-modification hypothesis,’ which proposes that low-density lipoprotein (LDL) oxidation represents a key early event. Nitric oxide (.NO) regulates critical lipid membrane and lipoprotein oxidation events by a) contributing to the formation of more potent secondary oxidants from superoxide (i.e.: peroxynitrite), and b) its antioxidant properties through termination reactions with lipid radicals to possibly less reactive secondary nitrogen-containing products (LONO, LOONO). Relative rates of production and steady state concentrations of superoxide and .NO and cellular sites...
Tipo: Journal article
Palavras-chave: Antioxidants; Free radicals; Lipid oxidation; Low density lipoprotein oxidation; Nitric oxide; Peroxynitrite.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000200017

Nitro-fatty acids: novel anti-inflammatory lipid mediators
Provedor de dados: 56
Autores: Rubbo,H.
Nitro-fatty acids are formed and detected in human plasma, cell membranes, and tissue, modulating metabolic as well as inflammatory signaling pathways. Here we discuss the mechanisms of nitro-fatty acid formation as well as their key chemical and biochemical properties. The electrophilic properties of nitro-fatty acids to activate anti-inflammatory signaling pathways are discussed in detail. A critical issue is the influence of nitroarachidonic acid on prostaglandin endoperoxide H synthases, redirecting arachidonic acid metabolism and signaling. We also analyze in vivo data supporting nitro-fatty acids as promising pharmacological tools to prevent inflammatory diseases.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitro-fatty acids; Antioxidants; Nitric oxide; Inflammation.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2013000900728

Obtenção de Suco de Romã (Punica granatum) em Pó.
Provedor de dados: 14
Autores: SANTIAGO, M. C. P. de A.; NOGUEIRA, R. I.; FREITAS, S. P.; GODOY, R. L. de O.; GOUVÊA, A. C. M. S.; BORGUINI, R. G.; PACHECO, S.
A cultura da romãzeira apresenta um grande apelo comercial devido à possibilidade de obtenção de produtos com características antioxidantes, como, por exemplo, seu suco com elevado teor de antocianinas. As antocianinas são importantes antioxidantes naturais responsáveis pela coloração do suco de romã. A utilização de tecnologias que favoreçam um maior aproveitamento do fruto agrega valor à cultura da romãzeira no Brasil, além de contribuir para disponibilizar produtos alternativos com propriedades potencialmente benéficas à saúde, os quais podem ser aplicados em formulações alimentícias. Este documento tem o objetivo de apresentar as etapas de obtenção de suco de romã por spray drying resultando em um produto em pó com elevada retenção de antocianinas.
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Agente encapsulante; Antocianinas; Compostos bioativos; Antioxidante; Processamento; Tecnologia de Alimento; Food technology; Antioxidants; Food processing; Vegetable products.
Ano: 2020
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1126529

Omega-3 Fatty Acids and Antioxidants in Edible Wild Plants
Provedor de dados: 48
Autores: SIMOPOULOS,ARTEMIS P.
Human beings evolved on a diet that was balanced in the omega-6 and omega-3 polyunsaturated fatty acids (PUFA), and was high in antioxidants. Edible wild plants provide alpha-linolenic acid (ALA) and higher amounts of vitamin E and vitamin C than cultivated plants. In addition to the antioxidant vitamins, edible wild plants are rich in phenols and other compounds that increase their antioxidant capacity. It is therefore important to systematically analyze the total antioxidant capacity of wild plants and promote their commercialization in both developed and developing countries. The diets of Western countries have contained increasingly larger amounts of linoleic acid (LA), which has been promoted for its cholesterol-lowering effect. It is now recognized...
Tipo: Journal article
Palavras-chave: Alpha-linolenic acid; Antioxidants; Chronic diseases; Edible wild plants; Evolutionary aspects of diet; Omega-3 fatty acids.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000200013

Osmoregulation, bioenergetics and oxidative stress in coastal marine invertebrates: raising the questions for future research
Provedor de dados: 5
Autores: Rivera-ingraham, Georgina A.; Lignot, Jehan-herve.
Osmoregulation is by no means an energetically cheap process, and its costs have been extensively quantified in terms of respiration and aerobic metabolism. Common products of mitochondrial activity are reactive oxygen and nitrogen species, which may cause oxidative stress by degrading key cell components, while playing essential roles in cell homeostasis. Given the delicate equilibrium between pro- and antioxidants in fueling acclimation responses, the need for a thorough understanding of the relationship between salinity-induced oxidative stress and osmoregulation arises as an important issue, especially in the context of global changes and anthropogenic impacts on coastal habitats. This is especially urgent for intertidal/estuarine organisms, which may...
Tipo: Text
Palavras-chave: Hyper-/hypo-osmoregulator; Hyper-/iso-osmoregulators; Osmoconformers; Antioxidants; Free radicals; Hypometabolism; Mitochondria.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00625/73717/74820.pdf

Oxidative stress action in cellular aging
Provedor de dados: 52
Autores: Oliveira,Monique Cristine de; Schoffen,João Paulo Ferreira.
Various theories try to explain the biological aging by changing the functions and structure of organic systems and cells. During lifetime, free radicals in the oxidative stress lead to lipid peroxidation of cellular membranes, homeostasis imbalance, chemical residues formation, gene mutations in DNA, dysfunction of certain organelles, and the arise of diseases due to cell death and/or injury. This review describes the action of oxidative stress in the cells aging process, emphasizing the factors such as cellular oxidative damage, its consequences and the main protective measures taken to prevent or delay this process. Tests with antioxidants: vitamins A, E and C, flavonoids, carotenoids and minerals, the practice of caloric restriction and physical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Cellular aging; Cell death; Oxidative stress.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000600009

Oxidative stress in five wheat varieties (Triticum aestivum L.) exposed to water stress and study of their antioxidant enzyme defense system, water stress responsive metabolites and H2O2 accumulation
Provedor de dados: 61
Autores: Chakraborty,Usha; Pradhan,Bhumika.
Five varieties of wheat (Triticum aestivum L.) - KW, UP 2752, PBW 343, SO and LV - were subjected to water stress and sampling was done on the 3rd, 6th and 9th day of stress. RWC decline in KW, UP 2752 and PBW 343 (36.65, 42.34 and 40.75% respectively) was comparatively lesser than in LV and SO (52.93 and 52.67% respectively). In all varieties tested, three antioxidant enzymes (POX, APOX and GR) showed an initial increase. The activity of POX and GR increased with the increase in the duration of stress in KW, UP 2752 and PBW 343, while the activity of APOX declined. However, CAT and SOD showed an initial increase in these varieties, whereas it declined in SO and LV with increase in the period of stress. Accumulation of H2O2 declined during prolonged water...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Carotenoids; Drought; Lipid peroxidation.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202012000200005

Oxidative stress is closely related to clinical severity of pre-eclampsia
Provedor de dados: 48
Autores: CHAMY,VERÓNICA M; LEPE,JAIME; CATALÁN,ÁLVARO; RETAMAL,DAVID; ESCOBAR,JORGE A; MADRID,EVA M.
Pre-eclampsia is a hypertensive disorder of pregnancy in which enzymatic antioxidant defenses fail and tissues are injured. This prospective case-control study evaluated whether pre-eclamptic women and their newborns show higher degrees of oxidative stress than normal pregnancies and sought to determine if this stress is related to clinical severity. Forty-four pre-eclamptic and thirty healthy pregnant women attending two hospitals in Valparaíso, Chile, were studied. The following plasmatic variables of antioxidant capacity were evaluated: glutathione peroxidase activity (GPx), total antioxidant capacity measured by oxidation of ABTS substrate (2,2'-azino-bis (3-ethylbenzthiazoline-6-sulfonic acid), and superoxide dismutase activity (SOD). malondialdehide...
Tipo: Journal article
Palavras-chave: Pre-eclampsia; MDA; SOD; GPx; ABTS; Lipoperoxidation; Antioxidants.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000200005

Pharmacology and toxicology of diphenyl diselenide in several biological models
Provedor de dados: 56
Autores: Rosa,R.M.; Roesler,R.; Braga,A.L.; Saffi,J.; Henriques,J.A.P.
The pharmacology of synthetic organoselenium compounds indicates that they can be used as antioxidants, enzyme inhibitors, neuroprotectors, anti-tumor and anti-infectious agents, and immunomodulators. In this review, we focus on the effects of diphenyl diselenide (DPDS) in various biological model organisms. DPDS possesses antioxidant activity, confirmed in several in vitro and in vivo systems, and thus has a protective effect against hepatic, renal and gastric injuries, in addition to its neuroprotective activity. The activity of the compound on the central nervous system has been studied since DPDS has lipophilic characteristics, increasing adenylyl cyclase activity and inhibiting glutamate and MK-801 binding to rat synaptic membranes. Systemic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diphenyl diselenide; Organoselenium; Antioxidants; Neuroprotection; Saccharomyces cerevisiae; Mutagenesis.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2007001000001

Phenolic Content and Biomolecule Oxidation Protective Activity of Globularia alypum Extracts
Provedor de dados: 52
Autores: Bouriche,Hamama; Kada,Seoussen; Senator,Abderrahmane; demirtas,Ibrahim; Ozen,Tevfik; Toptanci,Bircan Çeken; Kizil,Goksel; Kizil,Murat.
ABSTRACT The protective activity of methanolic (Met E) and aqueous (Aq E) extracts of Globularia alypum L. (G. alypum) against DNA, lipid and protein oxidative damage was investigated. Moreover, the scavenging, chelating, and reducing power activities of the extracts were also evaluated. Phytochemical analysis was performed to determine phenolic compounds. Results showed that Met E and Aq E were rich in phenolic compounds, and were able to scavenge DPPH˙ with IC50 values of 48.61 µg/mL and 51.97 µg/mL, respectively. In addition, both extracts were able to chelate ferrous ions. At 300 μg/mL, the chelating activity was 97.53% and 91.02%, respectively. The reducing power of these extracts was also remarkable and concentration dependent. At 100 µg/mL, both...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; DNA damage; Globularia alypum; Lipid peroxidation; Protein oxidation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132017000100422

Physical exercise prevents motor disorders and striatal oxidative imbalance after cerebral ischemia-reperfusion
Provedor de dados: 56
Autores: Sosa,P.M.; Schimidt,H.L.; Altermann,C.; Vieira,A.S.; Cibin,F.W.S.; Carpes,F.P.; Mello-Carpes,P.B.
Stroke is the third most common cause of death worldwide, and most stroke survivors present some functional impairment. We assessed the striatal oxidative balance and motor alterations resulting from stroke in a rat model to investigate the neuroprotective role of physical exercise. Forty male Wistar rats were assigned to 4 groups: a) control, b) ischemia, c) physical exercise, and d) physical exercise and ischemia. Physical exercise was conducted using a treadmill for 8 weeks. Ischemia-reperfusion surgery involved transient bilateral occlusion of the common carotid arteries for 30 min. Neuromotor performance (open-field and rotarod performance tests) and pain sensitivity were evaluated beginning at 24 h after the surgery. Rats were euthanized and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stroke; Striatum; Locomotion; Oxidative stress; Antioxidants; Running.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2015000900798

Polymeric emulgel carrying Cinnamomum tamala extract: promising delivery system for potential topical applications
Provedor de dados: 60
Autores: Arshad,Wajeeha; Khan,Haji Muhammad Shoaib; Akhtar,Naveed; Mohammad,Imran Shair.
Currently, the use of natural compounds obtained from plants tremendously increased due to their promising therapeutic properties. The aim of this study was to formulate a stable emulgel formulation loaded with Cinnamomum tamala (CT) extract. The antioxidant activity of plant extract was determined by DPPH inhibition assay. The extract was successfully loaded into an emulgels using different concentrations of carbopol-940, liquid paraffin, emulsifying agents and preservatives. Preliminary stability study was performed of 17 CT emulgel formulations at accelerated temperature of 50 °C for 2-months. Organoleptic evaluation, centrifugation, globule size, pH, electrical conductivity and rheological studies were performed for a period of 90-days at different...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cinnamomum tomala; Antioxidants; Emulgel; Physicak stability; Non-Newtonian; Pseudo-plasticity.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502020000100553

POLYPHENOLS DISTRIBUTION AND RESERVE SUBSTANCES ANALYSIS IN CACAO SOMATIC EMBRYOGENESIS
Provedor de dados: 37
Autores: GALLEGO RÚA,Adriana María; HENAO RAMÍREZ,Ana María; URREA TRUJILLO,Aura Inés; ATEHORTÚA GARCÉS,Lucía.
In order to understand the causes of lack of regeneration in cacao somatic embryos, two cacao varieties with different responses to regeneration potential were described based on their capacity to store different compounds. It is well known that seed reserves play a central role in the regenerative capability of somatic embryos; thus, we followed histochemical changes and reserve fluctuations of proteins, polysaccharides and polyphenols during somatic embryogenesis (SE) in the two cacao varieties. The study showed that, in somatic embryos of the regenerating variety, polyphenols were localized mainly in the periphery of the embryo (epidermal cells) and proteins were the main storage substance in the embryo expression medium, while the non-regenerating...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Histology; Reserve accumulation; Recalcitrance; Somatic embryogenesis.
Ano: 2016
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2016000200002

¿Poseen algunas algas de las costas cubanas propiedades antiinflamatorias analgésicas y antioxidantes?
Provedor de dados: 20
Autores: Llanio, M. D.; Fernández, M. D.; Mata, A.; Cabrera, B.; Valdés-Iglesias, O.; Díaz, C.; Cabranes, Y.
Marine organisms represent a new source for the discovery of anti-inflammatory agents (Grace et al., 1994), mainly obtained starting from sponges, coelenterates and algae. A representative compound from algae, due to its great number of properties, is the epitaondiol that inhibits the phospholipase A2 and the formation and/or release of prostaglandins and leukotrienes. Taking into account these antecedents, we decided to evaluate extracts from four Rhodophyte algae species of the genera Laurencia, Acantophora and Gracilaria in the models of mouse ear oedema induced by croton oil, writhing induced by acetic acid in mouse, and the assay of the tiobarbituric acid (TBA). The objective was to detect antiinflammatory, analgesic and antioxidant properties of the...
Tipo: Journal Contribution
Palavras-chave: Algae; Antioxidants; Algae; Antioxidants; Http://aims.fao.org/aos/agrovoc/c_258; Http://aims.fao.org/aos/agrovoc/c_511.
Ano: 2003
URL: http://hdl.handle.net/1834/3343

Prevalence of βS-globin gene haplotypes, α-thalassemia (3.7 kb deletion) and redox status in patients with sickle cell anemia in the state of Paraná, Brazil
Provedor de dados: 74
Autores: Shimauti,Eliana LitsukoTomimatsu; Silva,Danilo Grunig Humberto; Souza,Eniuce Menezes de; Almeida,Eduardo Alves de; Leal,Francismar Prestes; Bonini-Domingos,Claudia Regina.
The aim of this study was to determine the frequency of beta S-globin gene (βS globin) haplotypes and alpha thalassemia with 3.7 kb deletion (−α3.7kb thalassemia) in the northwest region of Paraná state, and to investigate the oxidative and clinical-hematological profile of βS globin carriers in this population. Of the 77 samples analyzed, 17 were Hb SS, 30 were Hb AS and 30 were Hb AA. The βSglobin haplotypes and −α3.7kb thalassemia were identified using polymerase chain reaction.Trolox equivalent antioxidant capacity (TEAC) and lipid peroxidation (LPO) were assessed spectophotometrically. Serum melatonin levels were determined using high-performance liquid chromatography coupled to coulometric electrochemical detection. The haplotype frequencies in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Hemoglobinopathies; Melatonin; Sickle cell disease; Thalassemia.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572015000300316

Protection against cephalosporin-induced lipid peroxidation and nephrotoxicity by (+)-cyanidanol-3 and vitamin E
Provedor de dados: 56
Autores: Cojocel,C.; Tolle,K.-L.; El-Hajj,H.; Baumann,K.
The ability of the clinically used cephalosporins: cephalothin, cefotaxime and cefotiam to induce lipid peroxidation (LPO) and renal damage was compared to that of nephrotoxic cephaloridine under in vivo conditions. Glutathione was measured in rat liver or in renal cortex as non-protein sulfhydryls. LPO was measured in plasma, renal cortex and liver by the generation of malondialdehyde or as the increase in renal cortical concentration of conjugated dienes. Impairment of renal function was measured as the decrease in renal cortical accumulation of the organic anion p-aminohippurate (PAH). Administration of cephalosporins to rats as a single dose (2000 mg/kg, ip) induced a significant glutathione-depletion in the renal cortex with cephaloridine, and in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cephalosporins; Glutathione depletion; Lipid peroxidation; Nephrotoxicity; Antioxidants; Vitamin E.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2007000600017

Protective effect of Cassia fistula Linn. on diethylnitrosamine induced hepatocellular damage and oxidative stress in ethanol pretreated rats
Provedor de dados: 48
Autores: PRADEEP,KANNAMPALLI; RAJ MOHAN,CHANDRASEKARAN VICTOR; GOBIANAND,KUPANNAN; KARTHIKEYAN,SIVANESAN.
Diethylnitrosamine (DEN), found in many commonly consumed foods, is widely reported to induce cancer in animals and humans. The aim of the present study was to investigate the hepatoprotective and antioxidant activities of the leaf extract of the medicinal plant Cassia fistula Linn. against diethylnitrosamine induced liver injury in ethanol pretreated rats. Albino Wistar rats, pretreated with ethanol for 15 days, were administered a single dose of DEN. Thirty days after DEN administration, hepatotocellular damage was observed histologically, along with elevated levels of serum AST, ALT, ALP, LDH, &amp;#947;-GT and bilirubin and a simultaneous fall in the levels of the marker enzymes in the liver tissue. Liver oxidative stress was confirmed by elevated...
Tipo: Journal article
Palavras-chave: Antioxidants; Cassia fistula; Diethylnitrosamine; Hepatoprotective; Lipid peroxidation; Silymarin.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000100013

QUALITY OF MINIMALLY PROCESSED ‘FUJI’ APPLE UNDER REFRIGERATED STORAGE AND TREATMENT WITH ADDITIVES
Provedor de dados: 94
Autores: MORENO,MARINES BATALHA; CANTILLANO,RUFINO FERNANDO FLORES; ROMBALDI,CESAR VALMOR; MANICA-BERTO,ROBERTA.
ABSTRACT  The aim of this study was to evaluate the ability to prolong the useful life of the minimally processed ‘Fuji’ apple by applying the individual or combined additives (L-cysteine chloride, L-ascorbic acid and calcium chloride) and to determine the appropriate period of storage of the whole fruit to perform the minimum processing. The experimental design was completely randomized in three-factor design with three replications. Factor A was composed of storage periods of whole apples, pre-processing, in cold chambers (20, 78, 138 and 188 days); the factor B was represented by storage periods minimum post-processing, simulating shelf life (3, 6, 9 and 12 days), and factor C was represented by chemical additives (distilled water, as control, 0.5%...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Malus domestica; Storage; Minimally processing.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452016000400902

Red cabbage (Brassica oleracea L.) extract reverses lipid oxidative stress in rats
Provedor de dados: 42
Autores: VEBER,BRUNO; CAMARGO,ANDERSON; DALMAGRO,ANA PAULA; BONDE,HENRIQUE LUIS P.; MAGRO,DÉBORA D. DAL; LIMA,DANIELA D. DE; ZENI,ANA LÚCIA B.
Abstract  Red cabbage (Brassica oleracea L. var. capitata f. rubra DC.) extract has been demonstrated hypolipidemic and antioxidant capacity. Herein, we investigated the effect of red cabbage aqueous extract (RC) or fenofibrate (FF) in oxidative stress induced by Triton WR-1339 in rats. The antioxidant capacity was evaluated through the superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GSH-Px) activities and, thiobarbituric reactive species (TBARS) and protein carbonyl (PC) levels in erythrocytes, liver, kidneys, cerebral cortex and hippocampus of male rats. The alterations promoted by Triton WR-1339 in enzymatic antioxidant defense in the liver, kidneys and hippocampus were reversed by RC or FF treatments. The TBARS and PC levels...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Red cabbage; Brassica oleracea; Oxidative stress; Antioxidants; Triton WR-1339.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100711

Red Wine administration to Apolipoprotein E-deficient Mice reduces their Macrophage-derived Extracellular Matrix Atherogenic Properties
Provedor de dados: 48
Autores: KAPLAN,MARIELLE; AVIRAM,MICHAEL.
Proteoglycans (PGs) from the arterial extracellular matrix (ECM) contribute to the trapping of LDL and oxidized LDL (Ox-LDL) in the arterial wall, a phenomenon called "lipoprotein retention". Moreover, we have shown that subsequent to their binding to the matrix, LDL and Ox-LDL are taken up by macrophages. Oxidative stress significantly increases macrophage secretion of ECM-PGs, lipoprotein binding to the ECM and the uptake of ECM-retained lipoproteins by macrophages. The aim of the present study was to determine whether red wine administration to atherosclerotic mice would affect their peritoneal macrophage-derived extracellular matrix properties, such as the glycosaminoglycan content and the ability to bind LDL. In addition, we questioned the ability of...
Tipo: Journal article
Palavras-chave: Antioxidants; Atherosclerosis; Extracellular matrix; Macrophages; Polyphenols; Proteoglycans; Red wine.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000200010

Role of pH on antioxidants production by Spirulina (Arthrospira) platensis
Provedor de dados: 58
Autores: Ismaiel,Mostafa Mahmoud Sami; El-Ayouty,Yassin Mahmoud; Piercey-Normore,Michele.
Abstract Algae can tolerate a broad range of growing conditions but extreme conditions may lead to the generation of highly dangerous reactive oxygen species (ROS), which may cause the deterioration of cell metabolism and damage cellular components. The antioxidants produced by algae alleviate the harmful effects of ROS. While the enhancement of antioxidant production in blue green algae under stress has been reported, the antioxidant response to changes in pH levels requires further investigation. This study presents the effect of pH changes on the antioxidant activity and productivity of the blue green alga Spirulina (Arthrospira) platensis. The algal dry weight (DW) was greatly enhanced at pH 9.0. The highest content of chlorophyll a and carotenoids...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Carotenoids; Phycocyanin; Total phenolic content; Radical scavenging activity; Antioxidant enzymes.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000200298

Salacia campestris root bark extract: peroxidase inhibition, antioxidant and antiradical profile
Provedor de dados: 60
Autores: Vellosa,José Carlos Rebuglio; Khalil,Najeh Maissar; Gutierres,Vânia Ortega; Santos,Vânia Aparecida de Freitas Formenton Macedo dos; Furlan,Maysa; Brunetti,Iguatemy Lourenço; Oliveira,Olga Maria Mascarenhas de Faria.
Reactive oxygen species (ROS) and free radical species have been implicated in initiating or accompanying many diseases in living organisms; there is thus, a continual need for antioxidants molecules to inactivate ROS/free radicals. Many studies of plants crude extracts have demonstrated free-radical scavenging and antioxidant action. Salacia species have long been used, in several countries, as traditional medicines against certain diseases and for their anti-inflammatory properties. In this study, Salacia campestris Walp (Hippocrateaceae) root bark ethanol extract (ScEtOH) was assessed for its ability to scavenge free radicals and reactive oxygen species; the results were expressed as percentage inhibition of the active species. ScEtOH was efficient...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Salacia campestris Walp/antioxidant properties; Hippocrateaceae; Myeloperoxidase; Reactive oxygen species; Antioxidants; Free radicals.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502009000100012

Sorgo na produção de alimentos sem glúten: propriedades sensoriais, nutricionais e funcionais.
Provedor de dados: 14
Autores: QUEIROZ, V. A. V.; MENEZES, C. B. de; CARVALHO, C. W. P. de; GALDEANO, M. C.; CAPRILES, V. D.; OLIVEIRA, F. C. E. de.
O presente documento tem o objetivo de reunir os principais resultados obtidos nas avaliações sensoriais, nutricionais e funcionais dos produtos sem glúten à base de sorgo integral desenvolvidos, até o momento.
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Doença celíaca; Composto bioativo; Alternative Food; Sorghum Bicolor; Alimentação; Alimento Alternativo; Antioxidante; Antioxidants; Celiac disease; Bioactive compounds.
Ano: 2021
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1133953

Species-Specific Antioxidant Power and Bioactive Properties of the Extracts Obtained from Wild Mediterranean Calendula Spp. (Asteraceae)
Provedor de dados: 5
Autores: Messina, Concetta Maria; Troia, Angelo; Arena, Rosaria; Manuguerra, Simona; Ioannou, Theodora; Curcuraci, Eleonora; Renda, Giuseppe; Hellio, Claire; Santulli, Andrea.
n this study we focused on four taxa of the genus Calendula (C. maritima, C. suffruticosa subsp. fulgida, C. arvensis, and the hybrid between the first two ones), collected in Mediterranean area (Sicily). Six extracts for each species were obtained using solvents with increasing polarity (hexane, ethanol 80%, acetone 70%, and water) and through extraction by supercritical fluids (SFE). It has been observed that the solvent with the highest extraction efficiency was ethanol 80% for all species. However, SFE extracts showed high antioxidant activity comparable to the ethanol 80% extract (polyphenol, DPPH, and reducing power method). These findings were confirmed by in vitro analysis (MTT assay) where it was observed that the tested concentration (24 µg/mL),...
Tipo: Text
Palavras-chave: Calendula species; Marigold; Supercritical fluid extraction; Bioactivity; Antioxidants; Polyphenols.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00591/70336/68389.pdf

Stomatal behavior and components of the antioxidative system in coffee plants under water stress
Provedor de dados: 63
Autores: Deuner,Sidnei; Alves,José Donizeti; Zanandrea,Ilisandra; Goulart,Patrícia de Fátima Pereira; Silveira,Neidiquele Maria; Henrique,Paôla de Castro; Mesquita,Alessandro Carlos.
Coffee (Coffea arabica) plants show a positive relationship between stomatal closure and formation and accumulation of H2O2. However, for coffee plants under water restriction such relationship has never been studied. The objective of the present study was evaluate the stomatal movement and the antioxidant capacity of coffee seedlings under different water regimes. Eight months old coffee seedlings of cv. Catuaí IAC 99 were submitted to field capacity, gradual and total suspension of irrigation during a period of 21 days. Evaluations of leaf water potential (Ψw) were performed in the beginning of the morning, and stomatal resistance, transpiration rate and vapor pressure deficit were determined at 10 am and 5 pm. All biochemical and enzymatic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea arabica; Oxidative stress; Antioxidants; Water stress.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000100012

Study on the Efficiency of Grape Seed Meals Used as Antioxidants in Layer Diets Enriched with Polyunsaturated Fatty Acids Compared with Vitamin E
Provedor de dados: 89
Autores: Olteanu,M; Criste,RD; Panaite,TD; Bunduc,V; Panaite,CV; Ropota,M; Mitoi,M.
ABSTRACT The 4-week study was conducted with 180 Lohmann Brown layers (52 weeks of age). The layers were assigned to three groups (C, E1 and E2). The basal diet (group C) consisted mainly of corn, soybean meal and corn gluten, and contained 19% crude protein and 11.58 MJ/kg metabolizable energy. The diets for groups E1 and E2 differed from group C by the inclusion of 5% flax meal and of dietary antioxidants. The concentration of α-linolenic acid in the fat of E1 and E2 diets was almost 10 times higher than in group C. E1 diet was supplemented with vitamin E (100 mg/kg feed, DM), while E2 diet was supplemented with 2% grape seed meal (polyphenols: 630.890 µg gallic acid equivalents/g sample; flavonoids: 5.065 µg rutin equivalents/g sample; antioxidant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eggs; PUFAs; Antioxidants; Grape seed meal; Quality.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000400655

Sulfites in beer: reviewing regulation, analysis and role
Provedor de dados: 63
Autores: Guido,Luis F.
ABSTRACT Beer is an extremely complex mixture of more than 3,000 different compounds in an aqueous environment. Thus, it is perhaps not surprising that the maintenance of beer quality throughout its lifetime has been a considerable challenge for brewers. Whilst it is inevitable that chemical changes will occur in beer with the passage of time, it is the formation of flavor-active components which is of immediate concern to an overview of beer shelf life stability. Sulfur dioxide has long been recognized by brewers as the most important factor in delaying flavor staling, and prolonging the shelf life of beer. However, nowadays, sulfur dioxide and sulfites are considered allergens and concerns about the safety of their use as food additives have been on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beer flavour; Sulfur dioxide; Legislation toxic effects; Antioxidants.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000200189

Superoxide dismutase, catalase, glutathione peroxidase and gluthatione S-transferases M1 and T1 gene polymorphisms in three Brazilian population groups
Provedor de dados: 74
Autores: Hiragi,Cássia de Oliveira; Miranda-Vilela,Ana Luisa; Rocha,Dulce Maria Sucena; ,Silviene Fabiana de; Hatagima,Ana; Klautau-Guimarães,Maria de Nazaré.
Antioxidants such as superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPX1) reduce the oxidation rates in the organism. Gluthatione S-transferases (GSTs) play a vital role in phase 2 of biotransformation of many substances. Variation in the expression of these enzymes suggests individual differences for the degree of antioxidant protection and geographical differences in the distribution of these variants. We described the distribution frequency of CAT (21A/T), SOD2 (Ala9Val), GPX1 (Pro198Leu), GSTM1 and GSTT1 polymorphisms in three Brazilian population groups: Kayabi Amerindians (n = 60), Kalunga Afro-descendants (n = 72), and an urban mixed population from Federal District (n = 162). Frequencies of the variants observed in Kalunga...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; PCR-RFLP; Gene polymorphisms; Brazilian ethnicities; Population genetics; Pharmacogenetics.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000100003

Ten Myths about Tannins in Sorghums
Provedor de dados: 30
Autores: Rooney, L.
Palavras-chave: Organic acids; Sorghum; Antioxidants; Pigments; Phenols; Linseed; Aromatic compounds; HPLC; Bakery products; Polymers.
Ano: 2005
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3264

The antioxidant properties of calafate (Berberis microphylla) fruits from four different locations in southern Chile
Provedor de dados: 118
Autores: Mariangel,Emilia; Reyes-Diaz,Marjorie; Lobos,Walter; Bensch,Emma; Schalchli,Heidi; Ibarra,Pamela.
The antioxidant capacity (AC), total anthocyanins (TA) and total phenols (TP) of calafate fruit from four locations in southern Chile (El Blanco, Lonquimay, Mañihuales and Temuco) were determined using both the free radical 2.2-diphenyl-1-picrylhydrazyl (DPPH) method and the linoleic acid oxidation inhibition method as well as the pH-differential and Folin-Ciocalteu methods. Phenolic compounds were also identified using HPLC-DAD (High Performance Liquid Chromatography-Diode-Array Detection). The results showed that TP varied significantly according to the location. Mañihuales was noteworthy, with 34.9 mg of GAE g-1 dried fruit. The measured AC level depended on the methodology used, varying significantly between locations according to the DPPH results....
Tipo: Journal article
Palavras-chave: Antioxidants; Antioxidant capacity; Berberis; Flavonoids; Phenolic acids; Total phenols.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000100014

The Effects of Different Types of Antioxidants (Se, Vitamin E and Carotenoids) in Broiler Diets on the Growth Performance, Skin Pigmentation and Liver and Plasma Antioxidant Concentrations
Provedor de dados: 89
Autores: Karadas,F; Erdoğan,S; Kor,D; Oto,G; Uluman,M.
Abstract This study investigated the effects of the addition of different antioxidants to broiler diets on their live performance, liver antioxidant composition and concentrations, immune response, and meat and skin color. A total of 945 three-day-old Ross 308 broiler chicks of both genders were randomly allocated to one of nine dietary treatments (n=105), with three replicates 35 chicks per pen, as follows: T1: control (commercially available corn-and soybean-based broiler diet); T2: selenium (control+0.5 mg/kg Sel-PlexTMSe yeast); T3: vitamin E (control+200 mg/kg Kavimix-E-50 a-tocopherol acetate); T4: lutein (control+100 mg/kg 5% Lutein Beads XB); T5: lycopene (control+100 mg/kg 5% Lyco Beads XB);T6: canthaxanthin (control+25 mg/kg 10%...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler; Antioxidants; Carotenoids; Performance; Immune response; Pigmentation.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000100101

The influence of dietary supplementation of arachidonic acid on prostaglandin production and oxidative stress in the Pacific oyster Crassostrea gigas
Provedor de dados: 5
Autores: Seguineau, Catherine; Racotta, Ilie; Palacios, Elena; Delaporte, Maryse; Moal, Jeanne; Soudant, Philippe.
In a previous study, dietary supplementation with arachidonic acid (ARA) to oysters Crassostrea gigas increased haemocyte numbers, phagocytosis, and production of reactive oxygen species level (ROS) by haemocytes (Delaporte et al., 2006). To assess if the observed stimulation of these cellular responses resulted from changes of ARA-related prostaglandin (PG) production, we analysed prostaglandin E2 metabolite (PGEM) content on the same oysters fed three levels of ARA. Dietary supply of polyunsaturated fatty acids (PUFA) could also induce an oxidative stress that could similarly increase cellular responses; therefore, two indicators of oxidative stress were analysed: peroxidation level and antioxidant defence status. Together the observed positive...
Tipo: Text
Palavras-chave: Prostaglandins; N-6 unsaturated fatty acids; Lipid peroxidation; Antioxidants; ROS production.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00040/15103/12785.pdf

The Role of Antioxidants in Cerebellar Development: A Review of Literature
Provedor de dados: 77
Autores: Imosemi,I. O.
Developmental pathologies may result from endogenous or xenobiotic-enhanced formation of reacting oxygen species (ROS), which oxidatively damage cellular macromolecules and/or alter signal transduction, and that the embryonic processes regulating the balance of ROS formation, oxidative DNA damage and repair, and ROS-mediated signal transduction may be important determinants of teratological risk. ROS can oxidize molecular targets such as DNA, protein, lipid in a process called oxidative stress resulting in cellular dysfunction and in utero death or teratogenicity. This review, consisting of literature search of journals and chapters in books aims at highlighting the importance of the cerebellum in controlling various motor activities in the body, as well...
Tipo: Journal article
Palavras-chave: Cerebellar development; Reacting oxygen species; Oxidative stress; Antioxidants.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100034

The sensitivity of sunflower (Helianthus annuus L.) plants to UV-B radiation is altered by nitrogen status
Provedor de dados: 65
Autores: Cechin,Inês; Gonzalez,Gisely Cristina; Corniani,Natália; Fumis,Terezinha de Fátima.
ABSTRACT: Interaction effects between nitrogen and UV-B radiation were studied in sunflower (Helianthus annuus L. variety IAC-Iarama) plants grown in a greenhouse under natural photoperiod conditions. Plants were irradiated with 0.8W m-2 (control) or 8.0W m-2 (+UV-B) of UV-B radiation for 7h per day. The plants were grown in pots containing vermiculite and watered with 70% of full strength nitrogen-free Long Ashton solution, containing either low (42.3ppm) or high (282ppm) nitrogen as ammonium nitrate. High nitrogen increased dry matter of stem, leaves and shoot, photosynthetic pigments and photosynthesis (A) without any alteration in stomatal conductance (gs) nor transpiration (E) while it reduced the intercellular CO2 (Ci) concentration, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Growth; Malondialdehyde; Peroxidation; Photosynthesis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000200251

Tipos de herencia en capsaicinoides, antioxidantes, azúcares solubles y caracteres morfológicos del fruto en chile manzano
Provedor de dados: 32
Autores: Sánchez Sánchez, Hermilo.
En frutos de los híbridos posibles formados con cinco progenitores de chile manzano  (Capsicum pubescens R. y P.) provenientes de Huatusco, Perú, Puebla, Tacámbaro  y Zongolica, se analizaron las concentraciones de capsaicinoides (capsaicina,  nordihidrocapsaicina y dihidrocapsaicina), clorofilas (a y b), vitamina C (ácido  ascórbico y dehidroascórbico) y azúcares solubles (estaquiosa, rafinosa, sacarosa,  glucosa, galactosa, fructosa y sorbitol), y se registraron los caracteres morfológicos  (peso y volumen de fruto, número de semillas, número de lóculos y longitud del  pericarpio). Se consideraron las cruzas directas y recíprocas mediante el análisis  dialélico del Método I de Griffing, para encontrar los efectos de aptitud combinatoria  general y...
Tipo: Tesis
Palavras-chave: Capsicum pubescens; Capsaicinoides; Antioxidantes; Análisis dialélico; Doctorado; Genética; Capsaicinoids; Antioxidants; Diallelic analysis.
Ano: 2009
URL: http://hdl.handle.net/10521/1319

Tomato and garlic by gavage modulate 7,12-dimethylbenz[a]anthracene-induced genotoxicity and oxidative stress in mice
Provedor de dados: 56
Autores: Bhuvaneswari,V.; Velmurugan,B.; Abraham,S.K.; Nagini,S.
Chemoprotection by dietary agents is a promising strategy for cancer prevention. The aim of the present study was to evaluate the combined effect of tomato and garlic against 7,12-dimethylbenz- [a]anthracene (DMBA)-induced genetic damage and oxidative stress in 12-14-week-old male Swiss albino mice. The animals were randomized into experimental and control groups and divided into eight groups of five animals each. Group 1 animals were injected intraperitoneally with 35 mg/kg body weight DMBA suspended in peanut oil as a single dose. Groups 2-4 animals received tomato (500 mg/kg body weight), garlic (125 mg/kg body weight) and a combination of tomato and garlic for 5 days by gavage, respectively, followed by DMBA 1.5 h after the final feeding. The doses of...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Antioxidants; DMBA; Garlic; Lipid peroxidation; Micronuclei; Tomato; Lycopene.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004000700012

Total polyphenol content and antioxidant activity of commercial Noni (Morinda citrifolia L.) juice and its components
Provedor de dados: 60
Autores: Bramorski,Adriana; Cherem,Adriana da Rosa; Marmentini,Chaiana Paula; Torresani,Joseane; Mezadri,Tatiana; Costa,Andréa de Almeida Silva.
The plant Morinda citrifolia L. (noni) has been the focus of many recent studies due to its potential effects on treatment and prevention of several diseases. However, there are few in vivo and in vitro studies concerning its composition and antioxidant capacity. The aim of the present study was to determine the total polyphenol content (TPC) and antioxidant capacity of a juice commercialized as noni juice, but containing grape, blueberry and noni fruits. Commercial noni juice was compared against its separate constituents of blueberry and grape juice. Folin-Ciocalteu and DPPH• methods were used to determine the concentration of total polyphenol content and antioxidant activity, respectively. Commercial noni juice presented higher values of TPC (91.90 mg...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Noni juice/antioxidant activity; Morinda citrifolia L.; Total polyphenols/determination; Antioxidants.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502010000400006

Toxic action of aqueous wheat straw extract on horse e purslane
Provedor de dados: 87
Autores: Khaliq,A.; Matloob,A.; Aslam,F.; Mushtaq,M.N.; Khan,M.B.
The toxic action of aqueous wheat (Triticum aestivum) straw extracts was investigated on germination, early seedling growth, some biochemical attributes and the antioxidant enzymes of horse purslane (Trianthemaportulacastrum). Aqueous extracts of wheat straw were prepared by soaking the wheat straw in distilled water in 1:10 w/v ratio and diluted to obtain the concentrations of 0, 25, 50, 75 and 100%. These were used as pre and post emergence in laboratory and screen house trials. Wheat aqueous extracts exhibited phytotoxicity to horse purslane by inhibiting and delaying its germination and suppressing seedling growth. Wheat phytotoxins in its aqueous extracts suppressed the chlorophyll content and soluble protein, and enhanced soluble phenolics and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phytotoxins; Germination; Seedling growth; Phenolics; Antioxidants.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582012000200005

Urinary excretion of L-carnitine, acetyl-L-carnitine, propionyl-L-carnitine and their antioxidant activities after single dose administration of L-carnitine in healthy subjects
Provedor de dados: 60
Autores: Cao,Yu; Hao,Chuan-ji; Wang,Chen-jing; Li,Peng-li; Wang,Le-xin; Guan,Hua-shi; Li,Huan-ting.
The urine excretion of L-carnitine (LC), acetyl-L-carnitine (ALC) and propionyl-Lcarnitine (PLC) and their relations with the antioxidant activities are presently unknown. Liquid L-carnitine (2.0 g) was administered orally as a single dose in 12 healthy subjects. Urine concentrations of LC, ALC and PLC were detected by HPLC. Superoxide dismutase (SOD), total antioxidative capacity (T-AOC), malondialdehyde (MDA) and nitrogen monoxidum (NO) activities were measured by spectrophotometric methods. The 0~2 h, 2~4 h, 4~8 h, 8~12 h, 12~24 h excretion of LC was 53.13±31.36 µmol, 166.93±76.87 µmol, 219.92±76.30 µmol, 100.48±23.89 µmol, 72.07±25.77 µmol, respectively. The excretion of ALC was 29.70±14.43 µmol, 80.59±32.70 µmol, 109.85±49.21 µmol, 58.65±18.55 µmol,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: L-carnitine/antioxidant activity; Acetyl-L-carnitine/antioxidant activity; Propionyl-Lcarnitine/antioxidant activity; Antioxidants; Urine excretion/analysis.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502013000100020

Uso de luz IV-C en la calidad del arándano azul (Vaccinium ashei Reade).
Provedor de dados: 32
Autores: Gallardo Sandoval, Araceli.
El arándano azul (Vaccinium ashei Reade) es un producto altamente perecedero, por ello es necesario implementar tecnologías postcosecha que aumenten la vida de anaquel y conserven las propiedades nutrimentales. Dentro de éstas tecnologías se encuentra la luz UV-C (254 nm) que ha sido utilizada en los últimos años en productos hortofrutícolas con la finalidad de reducir la incidencia de microorganismos patógenos y aumentar contenido de fenoles totales. En este estudio, se utilizaron frutos de arándano azul frescos de huertas comerciales de Zacatlán, Puebla, México, que fueron sometidos a tratamientos con luz UV-C en dosis de 1, 3 y 5 kJ m-2 y almacenados por 9 días a temperatura de 24 ºC (60 % de HR) y 4 ºC (80 % de HR) para evaluar la calidad organoléptica...
Palavras-chave: Arándano; Luz UV-C; Manejo postcosecha; Antioxidantes; Blueberry; UV-C light; Postharvest handling; Antioxidants; Fruticultura; Maestría.
Ano: 2013
URL: http://hdl.handle.net/10521/1911

UV-B radiation as an elicitor of secondary metabolite production in plants of the genus Alternanthera
Provedor de dados: 39
Autores: Klein,Fátima Rosane S.; Reis,Andressa; Kleinowski,Alítcia M.; Telles,Renata T.; Amarante,Luciano do; Peters,José A.; Braga,Eugenia Jacira B.
ABSTRACT Ultraviolet B radiation has been described as a potential elicitor agent of the synthesis of secondary metabolites in plants. Thus, the present study aimed to investigate the production of betalains and total flavonoids, as well as the antioxidant activity, of Alternanthera sessilis, A. brasiliana, A. tenella and A. philoxeroides exposed to different periods of UV-B radiation (280-315 nm). Plants of these four species were exposed to UV-B radiation for 0, 2, 4, 6, and 8 hours, which amounts to 0, 10, 20, 30, and 40 J cm−2 of radiation, respectively. Significant increases in betacyanin and betaxanthin levels were observed in A. sessilis and A. brasiliana during the period of UV-B exposure, while no differences were observed for the others species....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abiotic elicitor; Antioxidants; Flavonoids; Medicinal plants; Pigments; Ultraviolet radiation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000400615

Vitamin E and reduced glutathione in Prochilodus lineatus (curimba) semen cryopreservation (Characiformes: Prochilodontidae)
Provedor de dados: 83
Autores: Paula,Daniella A. J.; Andrade,Estefânia S.; Murgas,Luis D. S.; Felizardo,Viviane O.; Winkaler,Elissandra U.; Zeviani,Walmes; Freitas,Rilke T. F.
This study investigated the addition of antioxidants vitamin E and reduced glutathione on curimba (Prochilodus lineatus) semen cryopreservation and compared sodium bicarbonate solution and distilled water as activators. The experiment was conducted at the environmental station of CEMIG, in Itutinga-MG, Brazil, between December/2009 and January/2010. Semen samples (n = 7) with semen motility above 80% were diluted in cryoprotectant solutions composed of 10% methanol, 15% lactose and containing different concentrations of antioxidants: 50 (VE50), 100 (VE100) and 250 (VE250) µM of vitamin E, and 0.5 (RG0.5), 1.0 (RG1.0) and 1.5 (RG1.5) mM of reduced glutathione. A solution without antioxidants was used as a control. The semen was diluted at a ratio of 1:4...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Fertilization; Freezing; Reproduction; Sperm motility.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000300020

การพัฒนากระบวนการผลิตกล้าข้าวไทยอบแห้งเพื่อชงเป็นเครื่องดื่ม
Provedor de dados: 106
Autores: Suthaya Phimphilai; Aphiwat Teerawutgulrug; Kajorndaj Phimphilai; Pisuth Klinkajorn; Nuttida Kapkum; Chantima Thongbun; Suphanipa Kantkima; Suthawadee jaroenrat.
Tipo: Collection
Palavras-chave: Function food; Polyphenol; Antioxidants; Rice grass; ผลิตภัณฑ์กล้าข้าวอบแห้ง; กระบวนการผลิต; พอลิฟินอล; ใบข้าว; สารต้านอนุมูลอิสระ; เครื่องดื่ม; การยอมรับของผู้บริโภค; อาหารฟังก์ชัน; พันธุ์สุโขทัย 1.
Ano: 2012
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5366

ข้าวลืมผัวจากการวิจัยสู่การใช้ประโยชน์: การพัฒนาผลิตภัณฑ์ข้าวลืมผัว
Provedor de dados: 106
Autores: Acharaporn Na Lampang Noenplab; Supattra Suwantada; Pornsuree Karnjana; Sa-ang Chairintr; Supanee Jongdee; Karnjana Piboon.
Rice genetic utilization in terms of health product development that could draw up public attention is a significant scheme for rice genetic conservation particularly for traditional varieties. There are two levels of utilization; local and high-end level. Luempua is a traditional dark-purple traditional rice variety that undergone the study and development of health products for the local community level during 2011-2013 aiming for at least 1 easy to do product prototype each year. However, towards the end of the study, 16 food, desert, bakery and drink recipes were developed. Those with potential to be commercialized were analyzed in terms of total anthocyanin, one of the major antioxidant. This included cookie (28.20 mg Ascorbic acid/100 g), cake (12.09...
Tipo: PhysicalObject
Palavras-chave: Luempua rice; Coloured rice; Health products; Anthocyanin; Antioxidants; Nutraceutical; Glutinous rice; Nutrition therapy; Food processing; Product development; ข้าวเหนียวดำ; ข้าวสี; อาหารสุขภาพ; แอนโทไซยานิน; สารต้านอนุมูลอิสระ; โภชนบำบัด; พันธุ์ลืมผัว; การอนุรักษ์พันธุกรรม; คุณค่าทางโภชนาการ; การแปรรูปอาหาร; สูตรอาหาร; การพัฒนาผลิตภัณฑ์; กรรมวิธีการผลิต.
Ano: 2014
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5675